Apparently Steven Moffat Is a Total Liar and We’re Getting a Ridiculously Awesome Cameo in Day of the Doctor
Seriously, though. Spoilers. Like, HUGE ones.
We're going to count this one as a spoiler because not only is there no confirmation from a verified source at the BBC yet, but when we heard it, we were kinda bummed that we weren't going to get to be surprised by it during the episode. So yeah, click at your own risk, though you can probably guess where we're going by pointing out Moffat's lies.