Yesterday I finally branched the codebase, primarily so I could try out Unity 4 integration. So far it's looking great. I've even seen a single frame on the game running under Linux (it crashed before the next frame... Unity 4 is still in beta). Certainly I have confirmed that it will be a pretty straight-forward port.
The 1.1 beta will start in a month or two - until then there shouldn't need to be any new updates to 1.0 (but send in bug reports if you find anything nasty!)