I'm plopping this into Speculation for now, but a slip-up like this is usually a sign we're at least 80% of the way to an official press release on the subject. Right now Capcom's press FTP is listing Monster Hunter 3 for the US. The release date is a vague "TBA," but there'd be no reason to add it to the list of Capcom's upcoming games unless the company intended to do something with the game.
As far as the Japanese market is concerned, Monster Hunter 3 is probably the first highly-anticipated hardcore RPG for the system. Of course, Monster Hunter is already huge in Japan thanks to successful PSP and PS2 titles. The PSP Monster Hunters haven't been huge blockbusters in the US, but Capcom has blamed that on bad promotion. It'll be interesting to see if Capcom USA's crack PR team can turn the US perception of Monster Hunter around with the Wii version.
