According to IGN, which I respect as a source for information, especially on Sci-Fi related film/tv news, the whole Johnny Depp as the Doctor rumour is made of false.
The heavens have no idea how elated this makes me. I love Johnny, and I love the Doctor (duh), but Johnny as the Doctor is much bad. Do not want. Ever.
For one, the Doctor and the entire Whoniverse is so completely British that to have someone not from the UK play the Doctor would be a juvenile, ridiculous mistake. On top of that, much as I love Johnny and talented as he is, there's a quality beyond Britishness he doesn't possess which renders him incapable of portraying the Doctor. There's a combination of emotions and layers that Johnny does very well individually but as a composite I don't think he can pull off.
Oh yeah, and the most obvious point: WE ALREADY HAVE A DOCTOR. If you're going to make a film of Doctor Who, pick one of the most recent Doctors, each of whom is different and remarkable in his own way. Honestly, I think Tennant is the most 'bankable,' but Smith's quirkiness would surpass even what Depp could do with the role. I think that's my biggest issue with the idea -- a Depp Doctor would be a very quirky Doctor and the current Doctor excels at it and needs no replacing.
Plus, how do you account for Depp's Doctor in the line of regeneration? I don't want to lose the 12th Doctor to movies because some Hollywood yahoos think there's money to be made.
Doctor Who is a fairy tale and fairy tales have a lot to say about acting solely for the purpose of making money -- there's no reason to make a movie at all right now, much less one with Depp, other than to try and capitalize on a show that needs nothing to add to it beyond what already exists (which is my sly way of saying I love the audiobooks).