Roode and Wolves. Those 3 can be brought into WWE but I am not really looking forward to that happening. I am MORE than happy with having AJ Styles, Aries and Joe. These 3 guys had been my top 3 TNA guys until I stopped watching the show entirely.
Should, but won't. Roode's title reign a few years back was the best thing in wrestling. He's still amazing out there. Lashley has blossomed into the wrestler that many thought he could be before his premature push. MVP can talk his ass off, and was pretty amazing as the head of his faction in TNA with Lashley. MVP/Lashley vs Heyman/Brock would be incredible now, and people would buy it.
Nxt had a shot at the wolves and elected to not offer them a deal, so I doubt they get signed. Roode still has a while left on his deal, and Storm went back to TNA. I can't conceivably see them going after ex-wwe talent like Lashley or EC3, or even Eli drake. Vince and Trips seem like they might jus be too proud to admit they got it wrong in letting them go (although personally I think Lashley isn't worth it anyway).