The existing, working games (chess, checkers, and reversi) have all received upgrades and statistic tracking. This means that all of the game's listed achievements are available to get, and I've even instated a few virals that require you to beat developers or testers to receive them.
As for new additions, backgammon, go, and battleship are in the works. After a run-in with icon-size issues, every game now uses 24x24 icons which means a few boards are a bit larger than I had originally hoped:
Oh yeah, did I mention the game board floats in its own window now?
Now that I've finally deployed a decent-looking Go board, I'm looking into the game rules to make it the next playable game. After that, I'll probably brave Battleship, as its situation is unique -- having to keep track of four separate displays to work nicely.