Note that I'll be out of the country and away from my dev machine for 3 weeks starting this weekend...
Disappointing, but understandable. Have a good time, and don't forget about us when you come back.
That said, I'm leaning towards adding ANI features like the cross-frame stuff into EFF as a first step. That should result in smaller size on disk, and ANI behaviour is already there (I just have to make the new EFF stuff do the exact same thing). Then we can decide on packaging, which should result in the new format essentially being a superset of ANI in terms of features and able to use existing (tweaked or copied) ANI code. Code reuse FTW!