Williams was a late signing last year and he'll be a late signing this year. He will only want to play for a contender, so his potential teams list is limited too.
I hope the Hawks bring him back, he was a great depth piece, a leader, and I want him to have another shot at a ring. For some reason I felt really bad for him the most after the Super Bowl. He probably thought he was finally going to win one until that final play. He stepped up huge for the Hawks last year and we could use the depth this season.
I wouldn't expect him to sign anywhere until June at the earliest.