Don't know whether it's been mentioned or not, but the Royal Rumble has been revamped in a way. In Raw vs. SmackDown!, there's now a special move to throw people out of the ring, meaning you won't be able to just punch someone and have them do a somersault over the rope, which is an excellent addition in my opinion.
The opening taunts and stare-downs should be cool too, and from what I've seen the referee's counts are a lot faster. Apparantly there's also a Mission mode as well as a Career, and a new charisma stat.
Source: PSW Magazine.
If anyone does get the PSW magazine, watch the Mysterio/Benoit match and notice the voiceover man pronouce Benoit, "Benwit"