Yes, it has everything. Even Solomon Folly which was only on the PS3 before and not avaliable to the people who bought the original disk. Also a new hardcore difficulty mode which, again, owners of the original disk cannot get. Also the golden guns pack,
the warhorse, and the deadly assassin outfit.
So I would really get it if I was you. I would get it in a heartbeat if I had extra money to burn on a 2nd copy.