The new Bullet Physics SDK 2.83 is available from github. The biggest change is the new example browser using OpenGL 3+. For more changes and features, see the docs/BulletQuickstart.pdf as part of the release. For more information and download link, see http://www.bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=18&t=10527
Also, our proposal for a course on Bullet got accepted for the upcoming SIGGRAPH 2015 conference in Los Angeles.
Tuesday, 11 August 3:45 pm – 5:15 pm, Los Angeles Convention Center, Room 404AB
UPDATE: here are the slide decks: