Mario & Luigi: Paper Jam

The plot for this game is that Luigi knocks over the book he's holding in the picture down below, and then Paper Mario characters start falling out of the book. The video above showed Paper Mario, Paper Peach, Paper Bowser, and many well-known Paper Mario enemies, but I'm sure that their will be many other Paper characters in the game. For example, there will most likely be paper bosses too, even though the only boss shown in the trailer was 3-D.

Also, in all the other Mario & Luigi games (for those of you who don't know, there is a whole Mario & Luigi series), there were special moves on the field the Mario and Luigi preformed together. These moves could be the key to accessing hidden areas.

Mario & Luigi: Superstar Saga
High Jump

Mario & Luigi: Partners in Time
Spin Jump

Mario & Luigi: Dream Team
Drill Spin

Also, I found out about this funny boss from Mario & Luigi: Partners in Time called the L33T (elite) Hamm3r Broz. Here's a couple pictures: