As far as graphics are concerned - look at Super Mario Galaxy.. That game is just breathtaking, and it shows that if some effort is put in, games can look really nice on the Wii. Galaxy is going to be amazing - it'll definitely sell Wiis.
I also see a Kingdom Hearts spinoff on the Wii, but I think a "real" DQ game will be released on Wii instead of PS3.
A hockey game can most definitely be done on the Wii- they are already going the dual analogue route. With the controller, the analogue attachment would control the movement, while the remote would be like the stick. It would be amazing.