You can play with this live at http://demos.fabric-engine.com/ - would love to get your feedback. We're in open beta now, so if you want to see the implementation for yourself - go to the fabric-engine.com site and follow the steps in the Developers section.
Hi there - thanks for the feedback. We're looking for people to try and build things with Fabric - all of the work we've done on the bullet integration is open sourced, and Fabric will be free for non-commercial use..