As part of a Japanese-only Nintendo Direct today, Capcom showed a new trailer for Monster Hunter 4 on 3DS. In it, you'll see a variety of new monsters to kill (then gut and skin and sell, presumably), as well as a glimpse of what looks like being the biggest monster in the series to date, right at the end of the trailer. Take a look and see for yourself:
The game is due out this summer in Japan although specific dates and confirmations for other territories are yet to be confirmed. However, if you're feeling a lack of 3D monsters in your life, a demo of Monster Hunter 3 Ultimate is due to go live on the European 3DS eShop today, so maybe that can tide you over.