There has been talk about a Disney-produced Lone Ranger movie being in the works, and even rumors of a director being attached. Thus far, the only confirmed person attached to the film is Johnny Depp in the role of Tonto. However, according to Jerry Bruckheimer, Disney has its sights on doing another Pirates of the Caribbean sequel first:

That doesn’t mean that those other projects aren’t in development, but Bruckheimer told us that for Disney, the priority is most definitely “Pirates.” “It’s a great franchise for them and for us, too,” he said. “A beloved character and Johnny’s really excited about coming back to Captain Jack. He certainly is interested in Tonto, but Disney’s priority is to get ‘Pirates’ made first. You never know what’s going to happen, but they would like it.”
Source: comingsoon.net

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Personally, the first Pirates movie was fun for me, the second was okay, and I really didn’t like the third one. I don’t see why Disney feels the need to continue a story that has already been wrapped up (despite the fact that this franchise is a money cow), but then again, I don’t know why Disney does a lot of things…