Neil Gaiman has been revealed as the final author for the 50th Anniversary eBook range. Nothing O'Clock is the title for the 11th Doctor story that finishes the story. All the stories will be collected in a print version and be available later this month on the 21st the same day that the 11th Doctor eStory will be released. Here is the quote by Neil Gaiman and the synopsis for the story.
"Nothing O’Clock stars the Eleventh Doctor, the Matt Smith Doctor, with Amy Pond as his companion. I set it somewhere during the first season of Matt Smith, mostly on Earth, in our time now and in 1984, but also somewhere else, a very, very long time ago. I had never created an original monster for Doctor Who and really enjoyed getting to create a creepy Doctor Who monster of the kind that we haven’t quite seen before… I hope that the Kin will get out there and occasionally give people nightmares. And that you will be worried if a man in a rabbit mask comes to your door and tries to buy your house."
Thousands of years ago, Time Lords built a Prison for the Kin. They made it utterly impregnable and unreachable. As long as Time Lords existed, the Kin would be trapped forever and the universe would be safe. They had planned for everything… everything, that is, other than the Time War and the fall of Gallifrey. Now the Kin are free again and there’s only one Time Lord left in the universe who can stop them!