Everyone knows Japanese gamers always get the really cool, off-the-wall games at launch. Here's a quick rundown of the first-party games that haven't been announced for a US release!
Yakuman DS (temporary title) (price and release date not determined, developed by Nintendo)
And here's the obligatory "Mah-jongg game for the new Nintendo system." This is a game whose appeal completely eludes me, but for those of you who really dig Mah-jongg, please turn your eyes across the ocean because Nintendo's got your back. The Nintendo site claims that this is a "family-oriented Mah-jongg game" played via the wireless network. They tout it as a game that "Dad will buy and teach the kids how to play." It also promises to keep all the features that you loved from "Yakuman Advance."