JJ Abrams (Lost, Cloverfield) has the option Rolands_Father - I think he's got enough talent (more importantly, he's an avid fan of the series) to do it a level of justice. I can't see Abrams putting out some shithouse teleseries with bad effects.
What I'm worried about is the screenplay being a complete literal translation of the books. There's some dialogue and character interaction that would be plain hokey if done word-by-word on screen - I just hope the writers of the films understand the DT characters thoroughly so they can recreate them for the big screen. This is what normally lets King movies down, I think - the characters are not as believable as you'd hope - with notable exceptions of Shawshank and The Green Mile, and liberties were taken with both of those to make them work.
It wouldn't bother me if certain things were changed slightly to make a better film. And they'd need a fucking good cast - which comes down to the script again. Talented actors would just ignore a poor script.