Yuri L. Araujo, Associate Online/Community Specialist, Capcom U.S.A.
As for the online support, we've announced the Wii U can go online. 3DS has local multiplayer only. If that's something you really want to see happen, head on to the MH forums and start talking about it there - then I can bring it up the chain with some supporting evidence. =)
In response, the capcom unity community has started a petition.
http://www.change.org/petitions/capcom-co-add-online-multiplayer-in-monster-hunter-3-ultimate-for-3ds#
I know it's unlikely to happen, but how long does signing a petition take? I use gmail, so I can give my email as "myEmail+petitions@gmail.com" and set up a spam filter for anything sent to me with the +petitions tacked on, if they ever give away my email address. So far I haven't had to.