Jackson's publicist Sian Clements said yesterday "The big roles were being cast now and an announcement was likely in about a month. They would be filled by a mix of famous actors and unknowns". Rumoured names in the article include the reheated Keanu Reeves, Danny DeVito, and Anthony Hopkins for the role of Gandalf. Hopkins agent says that while the English actor hasn't shown any interest (he hasn't seen a script yet), "that's not to say he's not interested". His involvement could also depend upon how soon "Hannibal" gets off the ground.
Thanks to 'Kiwi'