Well, it's not actually offseason until after the bowl game on Dec 30...
...but that's really welcome news. Jack Plummer had already announced for the transfer portal and the question was whether that suggested that AOC was returning, or whether the young guns had been beating him out in practice.
O'Connell really locked down the starting slot this year, and there was some buzz that he had an outside shot at being drafted in the mid-late rounds. Coming back for a 6th year could significantly improve his stock, and he's pursuing a masters as well so if it doesn't work out, might as well finish that up.