That would probably be very sweet indeed :) .
Android's GC is constantly improving but I just don't know if it will hit the point where it is entirely invisible for a reasonably coded app (ie if you create heavy objects during each onDraw cycle, it is your fault and would result in shitty performances with any OS).
ARC sounds like an interesting way to do GC. From my limited understanding, the reference counting adds a non-null cost but it looks like a good trade-in against unpredictable GC pauses.
