Never played a FF before? :eek:
They have the typical JRPG elements (magic spells, upgrading, summoning power allies). It's the combat that differs greatly between the games. FFXIII is meant to be fast paced, so you only control the party leader as opposed to all three party members. You have the typical options to attack/technique/use an item. Using actions depends on a ATB bar, which is being constantly charged.
I think I've covered the bare basics :p I've never been to great at explaining things. Here a Youtube video of some gameplay
FFXIII Gameplay. Not the greatest quality unfortunately.