Scorsese and Depp for Sinatra biopic?

Reports are beginning to roll in of an authorized Sinatra biopic (with his daughter at the helm of making it happen) with Johnny Depp set to star. It definately sounds like an interesting project and will utilize Sinatra recordings rather than attempts to impersonate his singing. The obvious question has to be that if Sinatra was so well known for his blue eyes will Depp be changing that for the role? Even with Depp's undoubted acting ability and breadth of skill he still just doesn't seem imageinable as Sinatra for now. Since its Scorsese you know he must have seen something good to put him there though so for now all trust in this project lies with the man with the most famous eyebrows in the industry.