The new Bullet 2.76 SDK includes several new features and improvements. The new btInternalEdgeUtility avoid collisions against internal edges for smooth sliding along a triangle mesh. The cross-platform cmake build system support is improved and preparations are made towards upcoming OpenCL GPU acceleration for Bullet 3.x.
The new binary file format improves current and future tools support for Bullet.
The extensible .bullet file serialization is cross-compatible between 32/64bit, little and big endian, single and double precision and different Bullet SDK versions. This means you can export a .bullet file in Maya 64bit on a little endian Intel machine and import it on a 32bit big endian PlayStation 3.
For download of Bullet, the new Maya Dynamica plugin and further information see http://bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=18&t=4779