They normally wait until after Mania to do call ups, but I would suspect the NXT guys/girls who get Rumble spots are probably the ones in the running to get those call ups when they happen.
The interesting thing is how they follow up on the Nia thing imo. Was it a one time thing, or was it the start of them trying to normalize intergender wrestling? Even as a one time thing it was a stark change from a company who was known for advising women wrestlers they were interested in to not do them.