To get some Ganymede updates before they're publically available, point your Update Manager at:
Milestones and Release Candidates
These dates are subject to change. See Ganymede Milestones for the latest full schedule.
|M6 - API Freeze|
|M7 - RC0|
Eclipse projects have three communication channels: a mailing list for developers, a newsgroup for users, and Bugzilla. Ganymede, although not a "project" per se, will use the same structure: