Going to go out on a limb here and say that I think Disney has another flop on their hands with this one.
My gut tells me this is very much Tonto's movie and the Ranger "brought back to life" is very much the sidekick, with Tonto "pulling all the strings".
Personally I'll probably watch it just to see the new take on it and most likely enjoy it. Hell I enjoyed the 1981's The Legend of the Lone Ranger, which was a flop.
But you know what they say
Never mess with a Ranger!
You'll find the trailer on this page: http://www.imdb.com/list/TB56Gm1AqRw/#lb-1