I'm more excited about the DS RPGs next month -- Suikoden, Valkyrie Profile, and Black Sigil: Blade of the Exiled all on the same day! And Avalon Code looks like it could be a surprise. Probably going to buy Killzone 2 before DQ5 cause I've still got some RPGs to play through and I don't want to fall behind in Killzone's multiplayer, just in case the experience/class system ends up being more unbalanced than COD4 (which wouldn't be a surprise, considering how inexperienced Guerrilla Games is compared to Infinity Ward).
Assuming DQ9 actually makes it out this year, this is really going to be the year of the DS!