We have been sitting on Sonic CD as the newest game since WP8 launch. 3 Wednesdays have passed since I got my 822 and no new Xbox Live games. Sorry if I missed any news about this but are we expecting a new game tomorrow at least?
I have about ten games of AlphaJax on the go. It puts Words with Friends to shame. Check your Xbox Live privacy settings; there is an issue where they prevent you from being able to play. I didn't have to do anything - presumably because I regularly game on my 360.