Final Fantasy Versus XIII: The trailer shown reveals a blue haired man, a king of some sort, leaving his throne room and building to fight individuals that would steal the crystal from his home. A fight scene ensues, and the King apparently overwhelms them. The outside world is portrayed as heretical and chaotic, and the King-like individual easily beats his enemies with a mixture of his own skill and the power of the crystal. Here are some screens, courtesy of IGN.

Fina Fantasy XIII

The trailer shown was a remixed version of the one at E3. A few cityscapes were shown, but very little was suggested about the combat besides that it would be menu-driven. It ended in a near identical fashion to the original, except the unnamed heroines has a showdown with a large beast at the end of it.

Final Fantasy Agito XIII

We got an image of a desolate wasteland, then shifted to an island where a school apparently awaits. Student converge on the school, only to disappear and leave one young boy alone. He cuts his finger and touches a panel, setting the school alive as the building shifts around him. He examines a deck of cards, but the building collapses, and our friend gets KO'd.

Crisis Core: Final Fantasy VII

The trailer for this game introduced Aerith, notably not in her trademark pink dress, but rather a white and blue get up. Some combat was shown, and it all appears to be in real-time, eliciting different responses from the crowd. Zack was shown fighting off summons like Ifrit and Bahamut, while Zack's commander, Sephiroth, and Cloud were all introduced.