User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-65.175.202.244-20111021114547/@comment-969093-20111021140713

It's probably just the lobby that can contain more than 4 players. On the Japanese Adhoc Party there was room for 8 players per room. On the japanese MH3 server more than 10 people could join 1 city I saw. So most likely the same is the case for MH3G multiplayer. I also won't be surprised if it remains exclusive to the JP version either though.

However for some odd reason MHF1 does have room for more than 4 players I think. The quest board allows more than 14 quests to be posted at once. :/