No. Apple hasn't released the SDK yet and there have been no official announcements other than we should see it "in February" and some rumors that it's been delayed 1-3 weeks. Right now you have two choices -
1. Web-based games - http://www.apple.com/webapps/games/
2. Jailbreak games (and there is a Mahjong solitaire, but it's awful hard to see all those bricks on the screen)