The next few games I'm purchasing are Final Fantasy: 4 Heroes of Light for the DS, Sengoku Basara 3, Fist of the North Star: Ken's Rage, and Warriors: Legends of Troy. Hack-n-slash never gets old, IMO. I can massacre thousands of enemies every fucking day.
I may get Assassin's Creed: Brotherhood, since it does have a single player. Being a fan of the series, I might as well romp through Rome. Golden Sun DS is releasing this year as well. Should be good. I wish the Lufia and Dragon Quest VI remakes were releasing this year, but I guess they'll be localized next year.