About halfway down you'll see the information on Fox. This obviously has enough credence that Darin Gantt responded in the Rock Hill Herald. Gantt could offer no reason if wouldn't happen other than 'it's colder' in Cleveland.
Of course there are alot of rumors flying out there, but it appears maybe Fox staying isn't a bonafide done deal, not yet.
Curiously, Mike Holmgren, his targeted new GM Tom Heckert Jr and John Fox are all represented by the same agent.
EDIT: The rumors are heating up more and more. New link... definitely worth a read.