Animal Crossing, Mario Kart, Star Fox, F-Zero, maybe a new Kirby title, Pikmin...I have a feeling all of those will be Wii titles for '08, as well as the yearly Mario Party and Mario Golf/Tennis/Whatever games...
...that's most of their big IPs, so what does '09 have to offer? A revival of Kid Icarus is pretty likely, at this point...Punch-Out, maybe?
I have a feeling that '09 is going to be a bit of a drought for the Wii, myself, as far as first party titles go. Just a weird feeling, I guess. Hopefully though, we'll see a ton of awesome third party stuff out then.