According to Ballotpedia, Byron Donalds is looking at a 2014 run (he made some sort of statement of interest less than two months ago): http://ballotpedia.org/Byron_Donalds
Basketball coach Curt Clawson is also seeking the seat (and really paying up his occupation): http://www.curtclawson.com/
Connie Mack IV and Mary Bono can now live in the same state since their ouster from Congress. They should take advantage of this gift from voters.