Terry Pratchett reports that he is hard at work on the next Discworld novel, which will feature a new character and will not be part of any existing sub-series. It's been confirmed not to be Raising Taxes, the long-awaited third and final book in the 'Moist von Lipwig' sub-trilogy.
Meanwhile, pre-production is continuing on the City Watch TV series. Terry and Rhianna Pratchett have also clarified previous comments suggesting that Rhianna would be taking over the Discworld books once her father (who is suffering from early-onset Alzheimer's) retired from writing the series. Apparently Rhianna Pratchett has now ruled out this possibility, feeling it would not be appropriate to continue the main series without her father's involvement. However, she will be involved in possible spin-offs and future adaptations of the series to other mediums.