In a press release today Capcom announced:

"Capcom today confirmed that Monster Hunter 3 Ultimate on the Wii U system and Nintendo 3DS will bring the battle to retail stores in North America on March 19, 2013 and across Europe on March 22, 2013. The full game will also be offered for digital purchase on both systems during this launch timeframe and the Wii U game will fully support the voice chat functionality available on that system. For hunters looking to embark on their journeys sooner, free playable demos on the Wii U system and Nintendo 3DS will be available on February 21.

In Monster Hunter 3 Ultimate, players take on the role of a hunter sent to explore a settlement within the Monster Hunter universe, completing quests on their journey to seek and slay monsters while improving their skills and earning equipment upgrades. With many challenging monsters and over 200 quests, the latest addition to the series is set to be the most expansive offering to date. The game can be played alone, online (up to four players) on the Wii U system, or locally using up to four Nintendo 3DS systems or a combination of up to three Nintendo 3DS systems and one Wii U system. "