That makes sense, especially when you see Disney doing it elsewhere. They made all those announcements of upcoming projects but held off on one that was in the post-credits scene at the end of the season finale of The Mandalorian. Those other familiar characters who showed up in that episode show that Disney can pull off a surprise.
There have been rumors of those characters popping up in Disney+ series or the upcoming movies. A lot depends on how they want to handle it. Were mutants already present in the MCU? Do they come in from an alternate universe? Do they turn the House of M and Decimation storylines from the comics on their ear and have Wanda create them?
I'm guessing they go for something a little less batship and just start dropping them into different Disney+ series and movies. Maybe Ororo Monroe shows up in Black Panther 2, perhaps just a cameo in a funeral scene for T'Challa. Perhaps she ends up being a larger part of the plot. I'm guessing Falcon and the Winter Soldier is too soon for Wolverine, though I could see it if they mine some of his history with Captain America. WandaVision seems to open up some possibilities as well.