The update will include a completely reworked user interface, the new community square, a new trophy system, a card system, and several new gameplay modes. The most unique of them would have to be the new skill card system which will give players new special abilities to use during battles. Cards will have many varied abilities ranging from invincibility to transformations.
Another notable addition is the upcoming community square where players can see each others avatar and interact with them outside of battles, something that is missing from many room based MMOs.
Manga Fighter is already available and the season 2 update will be coming up on December 14th. You can get the game client and register for the free-to-play MMO at http://mangafighter.gamescampus.com.