Ms. Splosion Man hit XBLA yesterday and Twisted Pixel is already talking about DLC, and this isn't just regular DLC. It's FREE DLC! They plan on giving out weekly prizes to players who complete challenges on their leader boards or just give prizes to random players. No word yet on new levels, but who knows, Twisted Pixel loves their fans and are very giving.
If you haven't played or even heard of Splosion Man, you should download that game because it's super fun. And if you have played it, we highly recommend you download Ms. Splosion Man. You won't be disappointed.