http://www.microsoft.com/windowsmobile/en-us/totalaccess/software/games/mytopia.mspx
"Mytopia is a gaming community filled with high-quality multiplayer games. Available for free and exclusively to Windows Mobile users for a limited time, Mytopia lets you check out the first games that enable live play between smartphones and the web, including popular social networks. Play a game of chess or poker against your buddies on Facebook or MySpace—in real time and right from your phone.
Mytopia launches with 8 games: All-in Hold’em, Sudoku Master, Bingo Island, Chess Arena, Lucky Slots, Spades Master, Ace of Hearts, and Vegas Video Poker. Additional games are released every month.
Chat with friends, join teams, create private matches, or practice your skills against the AI. Earn experience points to gain higher levels and unlock new features. Meet up in Mytopia to play the games you love with the people you like."
So it looks like it's just gonna be casual gaming. Maybe they have something in the works to connect to Xbox Live, so maybe you'll be able to play arcade games like Uno against Live users. I would test it out if I had a smartphone, maybe someone else could.
