I don't know about you, but from the previews, he still seems like his "Jack Sparrow" self.
The voice, and heck, even partly his looks still reminds me of Captain Jack.
I could be crazy for thinking this but really, It's going to take a long time before I start seeing him as a Mad Hatter in the film.
I mean he even says "You naughty".
Does that not scream Jack Sparrow all over it, around it, and through it?