My guess is that when he abruptly quit last year, AD Foley talked him in to taking time off and improving his health, and if it didn't work out he'd have a year so he could secure a coach. Dan Mullen is an obvious choice. Although if Foley has had that much time he may get a bigger name.
Someone on ESPN said that every coach in the country is thinking about making himself a candidate as the new coach because Florida (followed by Texas) is the best college coaching job in the country. This was not Jesse Palmer speaking either.
I wouldn't be a bit surprised if Urban did this now because he wants Dan Mullen to take over for him. He was probably concerned Mullen was considering the Miami job. He's made enough money that he can take a few years off & rethink coaching.
Mullen would have won the SEC West if he had Newton. Their supporting cast is better than Auburn's and I'm an Auburn fan. Buddy can you spare a 180k. Florida can, and I wouldn't be surprised if Mullen leaves....