My gut feeling is that whoever they're hiring is already coaching a p5 team, hence, can't make the announcement in-season. So this rules out Rhule, Peterson, Patterson (not a head coach currently), imo.
And its not HCMJ, considering Trev wouldn't have delayed by 58 days to announce it.
We're about to get curbstomped by Michigan this weekend not sure how Trev would justify appointing HCMJ after that.