Nintendo's new Japanese commercials for the New Play Control version of Metroid Prime pretty well answer the question of how the new controls work. The commercials show example motions over in-game activities, revealing that the control scheme for the Wii remake of Retro Studios' first-person adventure game are similar to the controls found in Metroid Prime 3. The clip goes by too quickly and doesn't feature enough detail for us to determine if any changes have been made to the Corruption control scheme, but we doubt it.
This is basically what we expected, and we're delighted to see it: aside from a minor issue with the + and - buttons, the Wiimote/Nunchuk controls for Metroid Prime 3 were just right. We're quite excited about getting to use them in the magnificent first Prime.