Yes, there are some serious problems here. The danger of interference is never TOTALLY "dischargable" (nor should be those two "AA" - let's pray for them to NOT be "A-hA" instead!...
I'm a little concerned about the need of having to buy a rechargable couple AA batteries and a recharging device as well. I think it kinda sucks. Consider how much faster could the vibration function turned ON discharge your batteries while you're very enthusiastically playing Twilight Princess... blah, that would SUCK!.
Add to this an internal built microfone and the amount of hours with your Wiimote turned on before it is off could decrease dramatically. I don't know, just pure speculation (pretty much like everything else here...

).
Some intelligent usage of this limited amount of reserved electricity and everything might function just fine for me (and us... I mean... "Wii"...).
Playing a revamped (graphically speaking, of course) Mario Galaxy + some serious motion-sensitive controls and vibration (plus a built-in speaker for a more realistic aproach to the sound - as for example, the sound coming out of it's original, realistic point of origin e.g the sound of your baseball bat, which directly comes from, errrr, your baseball bat! And not from your Tv speakers!... - ) might be GREAT FUN and SATISFACTION POINT!.
I'm anxiously looking forward to it.
