Here is the final trailer for Final Fantasy XIII, so far nobody has subbed the video yet but when either I or someone does find a subbed version they could just post it in this thread.

In the trailer you'll see quite a few new characters and a glimpse of Vanille's summon. One of the characters revealed I think is Cid; from 2:06 to 2:12 you'll see Snowe held prisoner and a man greets him with an outstrechted hand - I heard the man say "Snowe" and I believe I heard "Shido" (Cid) as well but I am not certain. There are quite a few nice scenes - especially towards the end, overall I was very impressed by the trailer and am eager to see what the subbed version will reveal as well. Enjoy mortals.

YouTube - Final Final Fantasy XIII Trailer