Well it won't be Peter Jackson , he's solid with hobbit parts 1 ,2 and 3 for the next few years.
Kathleen Kennedy is going to be the producer as well as co-chair of Lucas film
(Raiders of the lost Ark ,Indiana Jones and the Kingdom of the Crystal Skull, Schindlers list , The Adventures of Tintin , War Horse ,Lincoln , The Bourne Legacy and directing Robopocalypse).
She has worked with Lucas and Spielberg quite a lot in the past.
So for director ???
James Cameron
Spielberg
David Yates (last couple of Harry Potter)
JJ Abrahams (latest couple of star trek movies)
Jon Favreau (Ironman)
Matthew Vaughn (Kick-ass)
George Miller (Mad Max)
?????