Deadline reports that Ryan Gosling along with others are being courted for the role of the Lone Ranger. It had been mentioned that George Clooney and Timothy Olyphant were being looked at. Gosling recently attached himself to Nicolas Winding Refn (Bronson) Logan's Run remake and it also involved with talks for Ruben Fleischer (Zombieland) Gangster Squad. Johnny Depp is locked in the role of Tonto which the film will be told from his character's perspective.
I'm not sure how likely it is that Disney would be able to wrangle Ryan as he's been avoiding franchise projects like this one. He however didn't rule out The Flash and Wonder Woman.