An extension to Monster Hunter Freedom
Yes this game is an extension to original Monster Hunter Freedom, so you can't expect new background story. The great work of Capcom is started by cutting the loading time while adventuring the parts of the map. To add the excitement there are new monsters to hunt down, which also means new combination of weapons and armors to forge.
It is also nice if you try multiplayer feature of the game with some friends, since this is what Monster Hunter actually all about: co-op hunting. There are some huge monsters created specially for these events, so spend your time together more.