When Capcom was asked about Monster Hunter 3 Ultimate having Miiverse support, such as a community in the Miiverse, here's what Yuri L. Araujo, Associate Online/Community Specialist at Capcom U.S.A. had to say.
You guessed it: no plans at this time. But I got it - I will "bring it up around the office. Pester some folks. Call in a favor" for ya.
Miiverse interaction, especially a community, really makes a lot of sense for a game like Monster Hunter. Let's hope at the very least, we see the game get community support. Thanks to Brian for the heads up!