Every year the night after WrestleMania has become the night that WWE debut's the new members of the roster that they usuaully have called up from developmental. In the past we have seen Brock Lesnar, Paige, Mankind, Umaga, Goldberg, The Great Khali, and I am sure many others. Point is the night after WrestleMania is usually the night for the new blood of the WWE to shine. With NXT getting worldwide exposure now through the WWE network most if not all of the talent down there are developing a fan base prior to their arrivals in WWE which in my opinion makes the change to the Main roster easier, because the fans already know who you are.
Who Might be Getting the Call?
Well as of right now I think that fact Kalisto is still in NXT is a crime because he and Sin Cara would add good depth to the WWE Tag Team division that is needed now with the disbandment of Dust Brothers, and Miz & Mizdow. So seeing Kalisto arrive on the Main roster "officially" the night after WrestleMania wouldn't be a surprise.
The other possibility seems less like a rumor and more like he's coming, that person is Finn Balor. Over the course of the last two big NXT specials in my opinion one person has stolen show just based on his entrances and that is Finn Balor. Finn is extremely talented in the ring and his entrance is like no other. Also it has been said Finn has his supporters among WWE management namely Triple H & Vince McMahon. Look I know the fact that if say I have been of fan of Finn's for a long time that doesn't mean anything if you compare me to someone who just became his fan and you'd be right, but fact is I can say that Finn hasn't changed a bit from his days on the Indies and now in WWE. WWE has allowed Finn Balor to be Finn Balor and though that freedom will likely not continue going to the Main roster you never know and I can honestly say that I am very happy Finn and am extremely excited for the future holds. Just imagine Finn Balor doing this entrance at WrestleMania in front 70-80,000 people. It would be Incredible!!!!