User blog comment:SimpleStar010/RUMOR: Monster Hunter Tri G at TGS/@comment-124.179.239.51-20110824221549

I doubt this is true. The Vita looks like it was designed specifically with MH in mind (and given how many sales of the PSP were solely due to MH, there's a decent chance it was), so I can't see why they would release a 3DS version. While I'm sure that Capcom would be able to make a perfectly enjoyable MH game on the 3DS, it would be so much more on the Vita.