Not sure if this counts as a "main roster call-up" or not, but on tonight (Mar. 2), NXT announced that tag champs the Revival will defend their belts against Enzo Amore & Colin Cassady on Mar. 12 in Toronto at Roadblock on WWE Network.
Enzo & Cass have been the subject of numerous rumors, most recently at Fastlane, where word was they could be introduced as part of the Edge, Christian and New Day segment.
For this feud, Dash & Dawson - the duo who make up the Revival - have been champs since last Fall, and defeated the New York/New Jersey duo at TakeOver: London. Zo & Big Cass didn't like that the heels hid behind their girl Carmella during that match and cut several promos complaining about it. They defeated the champs as part of an eight-man tag, and were rewarded with a parking lot beatdown of Amore.
There haven't been many reports of Raw plans for the Revival, whereas the Realest Guys have been touring with the main roster house shows, so that might indicate another loss for Enzo & Cass so they can be promoted full-time. But since these Network exclusive live shows are a relatively new concept, there's no clear precedent.
We'll find out a week from the Saturday.