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According to their website:
We’ve setup a Public Beta section with all the information you need to get started right away.
This includes a video tour by community super hero Ryan Irelan, F.A.Q., free 30-day full version trial of ExpressionEngine 2.0 PB, the User Guide, all First Party Add-ons, and links to Tech Support and the Bug Tracker.
For compatible 3rd party add-ons, check out Devot-ee.com, a stellar community run site dedicated to EE add-ons.
A full changelog containing a glimpse of what can be expected is available here: http://expressionengine.com/public_beta/docs/changelog.html#v200pb