Bangai-o for XBLA
http://www.1up.com/do/previewPage?cId=3181152
Disregard the fool who can barely comprehend this game yet feels entitled to show his face and talk about it, there's also some game footage in the video. Hard to say whether it will be as great as the DS version for now, it feels pretty different.
At least the network sharing thing means that really hard stages will be available.