While the audience may not exactly be crying out for it, Kevin Nash calling into WWE for a bit of action is always likely. His best friend is pretty much the boss, and Nash can basically do what he likes, when he likes. This is what he said in October, regarding a possible return:
"I have one more run. I'm started to get things fixed. I'm getting my shoulder fixed, I'm getting my neck fixed. I miss it, so never say never".
When he says "one more run" it sounds like a bit of a stretch, but he's absolutely got to be a strong contender for some sort of part-time involvement. Maybe it would be a link to the Balor Club, or maybe it will be a one-off appearance in the Royal Rumble in the same way he featured a few years ago. As an impact spot, he could offer something.