I'd put it behind a cut but it'll be all over the internet within... well it's probably already there.
My response? Hmmm. It's... a Doctor Who logo. The actual logo is nicely retro only with a new font, harking back to the first two logos the series ever had (I'm sensing a retro theme from Moffat, what with the Doctor's costume and the rejuvenated look of the Tardis plus St. John's sticker.) The Tardis version of the logo is gimmicky tosh. Let's hope we don't see a lot of that one.
ETA: It's interesting to me that Moffat is changing quite so many aspects of the show to launch his new era. Doctor, companion, Tardis (the interior is rumoured to be having a few changes), logo, plus presumably credits and maybe a remix of the theme? Usually regenerations cause so much nervousness that they like to contrive as much continuity as possible to reassure the viewer. This approach is certainly confident. But, particularly coming off such a popular and iconic Doctor as Tennant, will it alienate people or shed a chunk of viewers who feel that 'their' Doctor Who has finished?