Shooting the first episode of the new Doctor

April 3 is the day, according to the Telegraph's incredibly informative article/interview about shooting the first episode. One of many cool quotes:

When Tennant was completing his regeneration, he took to his bed. But Moffat hasn’t given Smith such an easy ride. 'I thought it would be fun if, while he was still regenerating, he had to run around and save the world,’ Moffat says. 'He’s barely out of the box when he realises: I haven’t changed my shirt yet and I’ve got 20 minutes to save the world. It’s like trying to save the world with flu.