The new Doctor has dumb hair.
Other than that, I don't really have anything else to add. I'm sure they will cut his hair when he begins filming, and if he's good enough for Steven Moffat, he's good enough for me! While I'm sad for David Tennant to leave, I'm excited to have a new take on the Doctor, and I kind of feel that 10's story has just about come to an end.
Here's some more info about the new guy, if you're interested.