Don't have a lot of info on this, but saw a story over on PG about this one and it's a surprise release coming this week (Oct. 3)! Loved the other Puzzle Quest games and pairing up with Marvel sounds like it could be a winner!
It's already out on Android. It's free, so I'm not sure if it's a pay to unlock or freemium BS kind of deal. Will try later today. From the screens it doesn't look as cool as Puzzle Quest 2.
It also appears to be out as a "soft launch" on iTunes in certain locations, one of them being the Phillipines. So if you wanted it now, you need to make a PH account. It's a free game, though, so you can make an account for that region without having to give payment info as long as you do it through "buying" the game and then creating a new account.
Yep, sorry, I missed this: http://forums.toucharcade.com/showthread.php?t=202054&highlight=Marvel+puzzle