He's pretty open about running. I'm not entirely sure if he will or not, but if he does enter the race, he'll probably clear the field. I'd rather have DeSantis run personally.
Agriculture Commissioner Putnam is running for Governor in 2018, while CLC is looking at running for CFO. Jeff Atwater, the current CFO, could run for Governor or Senate, but I think his best bet is to try and wiggle his way onto the gubernatorial ticket. DeSantis might possibly run for Attorney General, but frankly, I think that'd be a mistake. Case in point, the rise, plateau, and slow fall of Bill McCollum.
My understanding is Atwater out of all races