Here's a list of this year's rumored surprise entrants in the Rumble match:
Rob Van Dam - RVD is rumored to be a surprise entrant in the match, but it is still unknown whether it's just a 1 appearance deal, or a part time deal for a few months (possibly till WrestleMania).
Dudley Boyz - The Dudley Boyz, who have never participated in a Royal Rumble match, have been in talks with WWE officials for a while now about returning to their programming, and they are rumored to be the surprise entrants in the Royal Rumble match at the moment (not confirmed). There were reports last year that one of the two could end up in NXT as a trainer but we haven’t heard anything else about that.
Diamond Dallas Page - Another surprise entrant that the WWE officials want is a multiple time WCW World Heavyweight Champion, Diamond Dallas Page. Officials have wanted to do a program with DDP for a long time now, and it looks like they are finally going for it. If they go with this plan, then lets hope we get to see a confrontation between him & Randy Orton, who is expected to be back for the 30-man Royal Rumble match. It would be great to see the “Diamond Cutter vs. RKO” & interesting to found out if DDP can take some revenge on Orton for stealing his move!
Bo Dallas - It is expected that Bo Dallas will make a return to WWE TV at this event. He has been out of action since last November due to an injury.
Randy Orton - Orton has been advertised for several WWE events (including the Royal Rumble PPV) for quite sometime now, and has not yet made his return to WWE TV. This has lead to much speculation that he will be returning in the Royal Rumble match (given the fact that his surgery was planned in time so that he could return in time for the Rumble match).
* According to reports, 2 spots have been locked for entrants from NXT. There is a possibility that we might see Baron Corbin in the Rumble match.
