Advance Wars: Day of Ruin is the next game in the Advance wars series of turn based strategy games for the Nintendo DS. Day of Ruin takes a much darker theme than the previous bright and cheery advance wars though, with an apocalyptic meteor storm decimating the earth, and the survivors fighting to control what's left, it's much darker than the fight between the Orange Sun army and the Black Hole.
I personally can't wait to get the game, which has online battles with friends and random people. You can also make your own maps, and if I read the gamespot arcticle correctly, share them with friends locally, and over Nintendo Wi-Fi connection. I'm planning on picking this up January 21st, the day of it's release.