From the Preface to the new Tenth Edition:

The coming of the Internet and the widespread use of e-mail and the FAX machine have stirred interest in the concept of an "electronic meeting." This edition notes that the opportunity for simultaneous aural communication among all participants is central to the deliberative character of a meeting. It recognizes, therefore, that meetings may be conducted by videoconference or teleconference, when authorized by the bylaws and regulated by appropriate special rules of order and standing rules specifying such things as how recognition is to be sought and the floor obtained. On the other hand, it warns that while e-mail or FAX may provide a suitable substitute for postal mail in the issuance of calls for meetings or the conduct of mail voting, they are not suited for the conduct of the deliberative process under the precedents and procedures common to parliamentary law.

Some of the other more important points of revision are the following:

• The role of "established custom" in relation to written rules has been clarified.
• An explanation of the so-called "friendly amendment" is presented in a new subsection.
• New provisions relating to the notice and call of meetings have been added and a precise rule for the counting of days of notice required has been provided.
• A new subsection on the conduct of "public sessions" in appropriate bodies has been added.
• Notice has been taken of the use of such variations as "chair" or "chairperson" in place of "chairman."
• Clarification has been provided concerning the effect of referral of a motion to a committee on the freedom of the committee (and the assembly itself) to deal with amendments to the motion which were acted upon by the assembly prior to referral, including any with respect to which a motion to reconsider was pending at the time of referral.
• A rule prohibiting ballot votes "for" or "against" a candidate, as distinguished from a motion, has been introduced.
• References to federal, state, and local laws are restricted, wherever appropriate, to procedural rules prescribed by such laws, in recognition of the fact that rules of parliamentary procedure are concerned with the process by which a deliberative assembly arrives at a decision, and not with the wisdom, or even legality, of the decision itself. For similar reasons, the rule prohibiting rescision of a motion which is in the nature of a contract has been eliminated.
• The meaning of the term "majority of the entire membership" has been more clearly defined and greater prominence has been given to the cases in which it may be applied.
• Modified rules for Lay on the Table make it clear that, while this motion may never be used with the purpose of killing the pending motion without debate, it is proper to use it to set aside the pending question in order to bring up another motion which the majority considers more urgently important.
• New treatment of the motion to Fix the Time to Which to Adjourn establishes that the motion may not be used to set an additional meeting before an already scheduled meeting within the same session.
• Greater specification has been given of the cases in which an action is null and void so that a Point of Order may be raised to invalidate it without regard to the usual timeliness requirement.
• More comprehensive rules have been provided explaining when Suspend the Rules may not be used because doing so would violate a fundamental principle of parliamentary law or a basic right of an individual member.
• Provisions regarding Request to Be Excused From a Duty have been removed from the section on Requests and Inquiries and placed in a new, separate section.
• The rule establishing the time limits for a motion to Reconsider in a session of more than one day has been modified so as more accurately to reflect the purpose of the rule.
• The rules relating to reconsideration of negative votes on the motions to Commit or Refer, Postpone to a Certain Time, Limit or Extend Limits of Debate, for the Previous Question, and to Lay on the Table have been modified to give full effect to the rule that the motion to Reconsider cannot be applied to any motion which can be renewed.

In addition, the Tenth Edition clarifies:

• The definition of a deliberative assembly.
• The vote required to adopt a parliamentary authority in varying circumstances.
• That the chairs wording of a motion when it is put to a vote is the definitive version to be included in the minutes.
• The custom of "standing at ease," which has been distinguished from a recess.
• The difference in effect between recessing and adjourning.
• What may be considered at a special meeting.
• The propriety of motions to refrain from doing something.
• The undesirability of having "co-chairmen."
• The vote required to adjourn earlier than the time scheduled in an adopted agenda.
• When an adjourned meeting may be scheduled in relation to the next regular meeting.
• The circumstances under which a motion that conflicts with something previously adopted without being processed as a motion to Rescind or Amend Something Previously Adopted is, or is not, null and void.
• That Suspend the Rules may not be used with regard to rules that have their application outside a meeting context.
• The rules concerning Division of a Question with respect to which motions can and cannot be divided.
• The procedure to be followed when there is objection to a Request to Modify a Motion.
• Standard Descriptive Characteristic 2 of the motions to Rescind and to Amend Something Previously Adopted in order to reflect the manner in which these motions are most frequently applied.
• The rules respecting amendment of motions for which previous notice has been given.
• That the motion to Discharge a Committee may be used in a committee to discharge a subcommittee.
• That it is possible to move to reconsider a vote taken by secret ballot.
• The proper treatment to be accorded a motion to reconsider a vote on an adhering subsidiary or incidental motion which is made after the main motion to which the subsidiary or incidental motion adheres has been temporarily disposed of.
• Where corrections to the minutes are recorded.
• The vote needed to change an agenda or program previously adopted.
• The rules concerning preference in recognition to take account of the right to give previous notice of a motion.
• That members cannot be compelled to abstain from voting on the grounds of personal interest, even though they should do so.
• The time within which a member may change his or her vote.
• The proper use of "voting cards."
• Voting procedure when electing several members to a single office, such as directors, and in counting ballots with votes for more than one office or question.
• The recording of roll call votes and the conduct of electronic roll call votes.
• That a motion to take an informal straw poll is improper.
• That notice is not required before completing an election when a person who has been elected declines.
• The duties of the parliamentarian.
• Possible procedures for audits.
• The procedure for removal or replacement of committee members.
• Rules concerning amendments to the report of the Credentials Committee at a convention.
• The right of a member to appeal the action of the chair in ordering the removal of a nonmember.

NOTE: While Amazon.com also makes available other books with "Robert's Rules" in the title, be aware that only what it sells as Robert's Rules of Order Newly Revised is the current, official version. See The Right Book.