Wii Warm Up: Wiimote revision

It's not uncommon in the least for gaming hardware to be revised and changed. The GameCube controller made way for the Wavebird. The PS3's SIXAXIS controller paved the way for the Dualshock 3. Even the original Xbox controller was slimmed down eventually.

So, as perfect as the Wiimote is, how would you change it? Slim it down? Increase the battery life (uh, yes please)? How would you change or improve the Wiimote?