#1. Rob Van Dam

Rob Van Dam is a former World Champion in WWE, but he hasn't been seen in the company for a number of years after having a few personal issues. RVD has still been active in the wrestling world since his departure but made a clear a few years ago that he wasn't looking to make his return to WWE unless he was going to be part of a worthy storyline.
RVD started a buzz back in December when he revealed on Twitter that the wrestling world would be hearing from him soon. This could be RVD stating that he's about to step into a new role, but many believe that he could be looking for one last run in WWE where he could be making an appearance at this weekend's Royal Rumble.
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The fact that there has been no build towards a Rob Van Dam return could be why the former World Champion could be one of the biggest surprises.