It's Capcom's big game
Capcom's putting a lot of its eggs in Monster Hunter 4 Ultimate's basket. Recently announced as one of the publisher's games that will be shown at E3, Capcom hopes that the beefed up re-release will move 3.9 million copies.
There's a good chance its aim will be true on that estimate. Between introducing the game to Western audiences for the first time and likely doubling up on some consumers that bought Monster Hunter 4 in Japan, there's a decently sized audience out there eagerly waiting to team up and hunt some monsters on 3DS.