There's already been much speculation about a possible NA-based team league, but with the release of this video, it's pretty much confirmed (rumored name being NASL).
Now we just have to wait to find out if the mentioned 100k prize in the video is a.) the overall prize pool, or b.) the prize for the eventual champion. Either way, that's a lot of money, and is the biggest prize money in the west for Starcraft 2 so far.