Just like it’s iteration for the Wii (Monster Hunter Tri), Monster Hunter 3 Ultimate will have region-specific online multiplayer on the Wii U. For those hoping for an online multiplayer component on the 3DS version of the game, sadly it’ll remain adhoc only.

So what does region-locking of the online multiplayer means? Basically you’ll only be able to play with other players that have the same region as your game. No inter-region playing (US can’t enter Japanese servers, nor EU servers, etc).

source Siliconera, Nintendo Life