This information comes via a tweet by David Gibson, an analyst that we've reported comments from before...

MH 3G in USA - any time I ask Capcom, its the same answer...no plans but possible, would think now with MH 4 coming "spring 2013" it helps

Last time this analyst made comments, Capcom came out and said they had no idea what he was talking about. Take this latest round of comments as you will. Thanks to CdS for the heads up.