As you may know, Unity 3.2 has been released. The bad news is that QCAR applications will not work with this version out of the box. The good news is that we have a patch nearly ready, and will be releasing it early next week. I might suggest holding off on upgrading your Unity editor until then, if you want to be able to test your QCAR applications!
Thanks for your patience, I'll have an update as soon as the patch is available.