This information comes from an interview with Capcom Producer Ryozo Tsjmoto
“We’re looking into a bunch a different things and one of the things is definitely like, a lot of users have asked for voice chat. We’re looking into right now whether it’s technically possible or not. And so if it is, maybe we’ll make an announcement. If it isn’t, you know, if it realistically can’t be done, then I’m sorry we may have to leave it out. But we’re looking into it.”
It’s been clear for awhile now that Capcom is hoping to include WiiSpeak support for Monster Hunter 3. I’m not too sure what would hold back its inclusion, though. I do hope we see it in there!