It was rumored that Deus Ex 3 would change name to Deus Ex: Human Revolution, and those rumors can now be put to rest - because, well, it will be called Human Revolution! There you go.
Deus Ex 3...eh, Human Revolution (that's going to take a while to get used to, sorry Eidos) is a prologue to the other two games, where we'll get to play as the private detective Adam Jensen. The game is supposed to be released to the regular formats (except Wii), but no release date has been mentioned yet.