The first beta of the Native SDK for the BlackBerry ® PlayBook™ is now available.
Note the last link: you have to re-register your PlayBook even if you did it previously. The upgrade window is only for 24 hours after registering so you can downgrade later to a 1.0* release if you want to. Also note that as of this writing, the NDK samples at GitHub are still for PlayBook 1, not PlayBook 2.
This release has many new features including the Scoreloop SDK 1.0 beta 1 release. Check out the Release Notes for full details.