Series 6 Boxset to include mini episodes

The Complete Sixth Series, set for release on 21st November, will include five exclusive 'mini episodes', written by Steven Moffat.
According to SFX, 

The first four episodes are all connected, and set pretty much entirely in the TARDIS. Totalling twelve minutes, they collectively address the question: what does the Doctor get up to while Rory and Amy are asleep? Well, given that he doesn’t need as much sleep as we humans, he has adventures, of course – adventures with a certain flame-haired lady friend…

You can read SFX's reviews on the episodes here.