WWE NXT will air on Christmas day next week. It won’t be a live show so that means that they will have to tape matches ahead of time. This might mean that Mauro Ranallo and Nigel McGuinness can’t make the entire episode.
They recorded matches for NXT following WWE SmackDown this week. You can check here to find out what they’re airing on Christmas Day’s NXT episode.
Beth Phoenix and Tom Phillips came out to call the NXT action in the ring. This means that Mauro Ranallo and Nigel McGuinness likely won’t be heard during those matches.
They could always record commentary later on, but it might be a case of different announcers for the show.