Favorite: Graham Moore, The Imitation Game
Other nomination predictions:
1) Paul Thomas Anderson, Inherent Vice
2) Ethan Coen, Joel Coen, Richard LaGravenese, William Nicholson, Unbroken
3) Gillian Flynn, Gone Girl
4) Anthony McCarten, The Theory of Everything
Gillian Flynn may end up winning for adapting her own work and changing the ending for the suspenseful Gone Girl. Jon Stewart may also pop in here for adapting the script for Rosewater, an effort he also directed and produced.