There have been a lot of aggregated articles the past 24 hours about the NCAA possibly banning the punt return like North Texas pulled off last weekend. All of them have stemmed from the same tweet from Tommy Craft, who is a radio host in Fort Smith.
Today an NCAA spokesman put an end to that rumor.
https://twitter.com/BonaguraESPN/status/1042134187904385025
Rule changes are discussed during the off-season. I don’t know if it would have been unprecedented, but I can never remember the NCAA changing a rule mid-season.