Personally, I want them to make a new Shining Force game that stays true to it's original form. Shining Force, Shining Force 2 and Shining Force III were amazing, epic games that deserve much praise.
Granted, an action-rpg like Shining Force Neo and EXA would probably fit better with the Wii's control scheme, but the original Shining Force format (a strategy RPG, of sorts) would just be so great. The game need to go back to it's roots, and the Wii would be the perfect console to allow that to happen.