Well, I guess they had to put something
out there after the DWM snafu scooped them.
Edit: they've also tweeted a photo of Billie Piper: https://twitter.com/bbcdoctorwho/sta...4223736782848/
For those not reading the "One Two Eight Ten" thread, the latest issue of Doctor Who Magazine
has arrived early, and given away a planned announcement that Tennant and Piper will return for the 50th anniversary special, which also stars John Hurt. Other casting is still secret.