Considering the gimped Wii verison of Unleashed outsold the PS3 and 360 versions combined, they'd be pretty dumb not to do a Wii version of this game too. Though if it does go multiplat with Wii, I'd probably still get the HD version because they'd put more work into it.
"Now, a fun game should always be easy to understand - you should be able to take one look at it and know what you have to do straight away. It should be so well constructed that you can tell at a glance what your goal is and, even if you don’t succeed, you’ll blame yourself rather than the game. Moreover, the people standing around watching the game have also got to be able to enjoy it." - Shiggy