I think Balor and Neville will be up shortly after Mania.
I don't know what they have planned with Zayn. Ridiculous he's been there this long.. I'd like to think they're paying him a good bit extra because of it.
Poor Tyler Breeze.. I can't see anything good happening for the guy really.
Unsure on Owens.
Another while for Sasha and Itami.
Neville - there is nothing left for him in NXT, while Zayn still have Owen's blow off. Charlotte is likely up with main roster soon as well. I think Finn would be next, around Summer Slam. Same with Sasha.
For me it's a toss up between Breeze, Zayn, and Neville, if not 2/3.
Breeze has literally nothing to do on NXT. He's currently in a thrown together feud with Hideo Itami. I don't like it. It's just basically "I attacked you from behind, so we're fighting." No real reasoning. Call him up instead of letting him fester down there. He's BEEN ready to go.
Sami Zayn should be written off NXT permanently. You can sell the idea that he was never the same again after running into Kevin Owens and didn't have the guts to show his face on NXT. No reason for him to come back. He's done everything there is to do and he's been there for FAR too long.
Adrian Neville is really exciting to watch in the ring, but he's getting stale as well. I want to see him impress people on the main roster because the NXT crowd has seen it all. No real reason for him to still be there either. Just keep him OFF the mic.
I don't see anyone debuting the night after Mania. I'd rather them just feature NXT on RAW in some kind of amazing, smark fapping 20 minute match. At least for right now. I'm basing this off the thought of them not having anything good creatively for anyone being called up at the moment.
If WWE has some grand scheme cooked up, sure call them up. Other wise, leave them be. Least we forget about what happened with The Ascension, Bo Dallas, Emma, Big E, & Adam Rose.
I could see Breeze, but I do think they should have him dye his hair platinum blonde to differentiate him from Ziggler. The comparisons will exist unless he changes a few things up.
Outside of that, I think there's a very good chance that Neville debuts immidiately to take advantage of the highly International crowd, and I could see Charlotte debut into a feud with AJ, and Paige vs the Bellas and maybe heel Nattie?
Samoa Joe could also go straight to the main roster, and if that were to happen, doing it on the post-Mania RAW would be the perfect audience to debut him in front of.