Guys, I think you really need to tamper your expectations in terms of "Retro's new IP".
For one thing, our own Chris FOM claims that he's in contact with Retro employees, and...
Not only that, but
Emily Rogers herself just recently said the rumor isn't exactly trust worthy.
Chris FOM's "all say that Emily Rogers has no idea what she's talking about." comments makes me believe that Retro is indeed working on either DKC or Metroid Prime, contrary to Emily's sources. If I was a betting man I'd go with DKC, but I think there's a chance it could be Metroid Prime 4, as a way for Nintendo to gain goodwill back with Metroid fans and general core gamers.