According to some obscure rumor column from Japan-based Game Lab, a newly enhanced Wiimote is in the works. The rumor, via Game Front, suggest Wiimote 2.0 will included "better grip" and rechargeable batteries out of the box, and that the revised controller will hit Japan sometime this summer. A bit early, no? And as always, this is simply internet hearsay. But rechargeable batteries are always welcome.
[Nota bene: Game Front doesn't use permalinks so you'll have to scroll down about three quarters down the homepage to find the article.]