On my list, I have:
For Wii:
Mario Kart Wii.
For DS:
PMD2: Explorers of time (I want to get a Riolu!)
Final Fantasy Crystal Chronicles: Rings of Fate (It has voice acting! :O ;) :D )
So, what are you getting after? I've heard there is another Guitar Hero game coming to the Wii too.
Guitar Hero for the DS and Pokemon Mystery Doungeon: Explorers of Time look the most fun to me.
This really has nothing to do with Brawl, so, guess what, locked. To answer the question, Mario Kart Wii, PMD, a movie spin off or two, who knows.