16 couples this season, and it's even with 8 men and 8 women:
Donny Osmond (Entertainer)
Ashley Hamilton (Actor-son of season 2 contestant George Hamilton)
Michael Irvin (Former Cowboys Wide Receiver and NFL Hall of Famer)
Mark DaCascos (TV Chef)
Chuck Liddell (Ultimate Fighting Champion)
Louis Vito (Professional Snowboarder)
Aaron Carter (Singer/Reality Star)
Tom DeLay (Umm...okay Former House Majority Leader)
Kathy Ireland (Model)
Macy Gray (Singer/Actress)
Melissa Joan Hart (Actress)
Kellie Osbourne (Reality Star/Singer)
Debi Mazar (Actress)
Natalie Coughlin (Olympic swimmer)
Joanna Krupa (Model-ugh)
And the confirmed pros that have said to be returning: Anna Demidova (last year's winner from the pick a pro contest), Cheryl, Lacey, Edyta, Karina, Louis (yay Louis!), Maks, Alec, Derek, and Mark. I'm betting Kym, Tony, Dmitry, and Chelsie will be back, and rumors are going around Jonathan and Anna T. are returning.
Pretty happy with this cast so far Kathy Ireland is a pleasant surprise, but I'm very happy. Melissa must have given up her boycott after finally being cast Please, give Donny to Kym, Edyta, or Karina. Donny, Kellie, Macy, Melissa, Debi, Joanna, Aaron, and the last minute spoiler of Tom proved accurate. Okay, so I take it back, I liked the first 8 better than the last 8. Give it to Donny, he's got it. Please let Joanna go first, and let anyone but Maks, Alec, Louis, and Tony get her. No Vera Wang who was originally rumored, or Lou Ferrigno. And no returnees from the injured list. I didn't like last season pre-show based on the cast but loved it after it started, so hopefully this season turns out like last season. I wonder if Tom was Kurt Angle's replacement. I'm guessing he's first out. Debi hasn't aged well. Based on fan bases and popularity, I think Donny wins that contest by a landslide, followed by Macy, Mya, Melissa, Aaron, and Kellie.
Some other tidbits: halfway through the season, they're going to do double eliminations and eliminate 2 couples per week. New dances this season, and a 3 night premiere.