At the BBC Drama Showcase this evening, the BBC Controller of Drama, Ben Stephenson, announced that:
As part of the BBC's blockbuster celebrations to mark the Doctor turning 50, fans will be able to see the Time Lord and his adventures like never before - in 3D! To be broadcast using some of the BBC’s HD capacity, Steven Moffat, lead writer and executive producer, said: “It's about time. Technology has finally caught up with Doctor Who and your television is now bigger on the inside. A whole new dimension of adventure for the Doctor to explore."At the moment, it's unknown whether it will only be available via 3D televisions or whether it will be similar to the "Derren Brown 3D Magic Spectacular" on Channel 4 where you could buy the 3d glasses via Sainsburys supermarket.
Update: According to "The Guardian", the BBC are "working out the logistics" of special cinema screenings of the 3D episode:
"It's a nationwide celebration of both Doctor Who and the BBC because I think they are so synonymous. We will be doing a big Doctor Who special in 3D which is very exciting and feels very innovative," he said.
"We will be doing it on cinema screens as well. We are working out the logistics of that at the moment because we need to make sure the main BBC1 experience remains absolute value for money for the audience."