Capcom has released a new patch for Monster Hunter 3 Ultimate, which allows for off-TV play on the GamePad as well as cross-region online play with US players.
Below is the official tweet:
#MH3U Wii U players, download the software update for Off-TV Play on the GamePad and cross-region online play with US players today!
— Nintendo of Europe (@NintendoEurope) April 16, 2013
You can view the launch trailer here.