Information is currently provided on the Inter Partes Disputes page (LINK) and the Frequently Asked Questions page (LINK) on the USPTO's AIA Implementation Information site (LINK). Additional information will be provided here soon.
Rules of Practice for Trials Before the Patent Trial and Appeal Board and Judicial Review of Patent Trial and Appeal Board Decisions: LINK
Specific Rules (PART 42; Subpart D - Transitional Program for Covered Business Patents (CBM)): LINK
Definitions (42.301): LINK