It appears Wisconsin's bid for Regionals at the Kohl Center in 2010 and 2011 were denied. On the flip side, the Resch Center in Green Bay was awarded the Midwest Regional in 2011. It will be hosted by Michigan Tech.
While some might say the Kohl Center was not full enough last March, I think drawing 10,000 fans was rather impressive, especially compared to a lot of other Regionals. I think the NCAA would be foolish not to sell 10,000 tickets again at this venue in the future.
As people commented over on USCHO, St. Louis received the West Regional in 2011. While the huge NHL arenas work for the Frozen Four, that seems rather extreme for a Regional, not to mention the lack of local schools to draw for a big crowd.