you know, this thread has really warmed me up to the idea of rev using AAs intead of built-in recharables. Personally,
I want the REV to last as long as possible. Also, it would be annoying to have to stop playing to recharge because a controller runs out of batteries (I'm assuming that, thanks to the motion control, you wouldn't be able to use the REV while its charging.)
Recharables were good for portables because portables: drain batteries quickly, can be played easily while chraging, and are generally only used for a couple of years.
None of that is true for the REV. Also, with the REV, you'll only have to replace the batteries every so often (if they can get 10 or so hours out of a dual-screened, backlit self-contained system that's about as powerful as an N64, then I'm betting they'll be able to get 50 or so hours out of the REV controllers....even taking into account motion control, rumble, and attachments), so having it run off of AAs won't be that big of a deal.