The first season contains three episodes, the DVD/Bluray package comes as usual with bonus material and also with an unaired pilot. At the moment season 2 is in production and should be available sometime 2012.
From the producer: Co-created by Steven Moffat and Mark Gatiss, Sherlock stars Benedict Cumberbatch as the new Sherlock Holmes and Martin Freeman as his loyal friend, Doctor John Watson. Rupert Graves plays Inspector Lestrade.
The iconic details from Conan Doyle's original books remain – they live at the same address of 221b Baker Street, have the same names and, somewhere out there, Moriarty is waiting for them.
Steven Moffat says: "Conan Doyle's stories were never about frock coats and gas light; they're about brilliant detection, dreadful villains and blood-curdling crimes – and frankly, to hell with the crinoline. Other detectives have cases, Sherlock Holmes has adventures, and that's what matters."