Here's a link to a recent forum with all those details -
http://220.127.116.11/minisites/terrypr ... php?t=1817
The next book has been announced as Snuff based around Vimes and a sort of sequel to Thud.
Its finished in some form but still a while away.
'Dead tree technology!
Information that , if carefully stored , would last for millennia! And no batteries required.'
'There is no future for e-books, because they are not books. E-books smell like burned fuel.'
Ray Bradbury (RIP)