DDP was discussed as a possible surprise entrant in the Royal Rumble match, to the point that there was some contact between him and the company. However, for whatever reason it didn’t happen and he will not be in the match.
In addition to Carlito and Shelton Benjamin, Chris Masters and Shane “Hurricane” Helms have been spotted hanging out with the WWE crew in Phoenix this weekend. There is no confirmation that they will be in the Royal Rumble match, though.