Here are some new images of Square Enix's Final Fantasy XIII for PS3 and Xbox 360. A number of new elements can be found in the battle scene images.
It is possible to evade and counterattack
Lightning's weapon can morph into other weapons in battles. For example from gun to blade
You can score multiple hits on an enemy, or an enemy can have multiple targets
You can hit multiple enemies at once with specific attacks/weapons
It is possible to store multiple commands and execute them at once
There is no MP in the game, each spell/skill has a maximum number of use or require charging to use
The game seamlessly transition between field and battle scenes
In the field you can see the enemies, warning signs appear on enemies who aware of your presence
There is a Chain Bonus and Break Bonus system in the game, details unknown
You can visually see the enemy name and the HP in battle