Potter starlet Emma Watson updated her official website with this yesterday. They're already underway with Part VII!!
"On Monday I go in for test shoots for Harry Potter and the Deathly Hallows (part 1). I am quite excited to be back actually. I don't think I have seen Dan since the summer since he left for NY and Rupert since Autumn. I think I have a couple of costume fittings and a hair appointment to make my hair a bit browner. Not sure whether we have a couple rehearsals as well.
Excited to see if they have cast anyone yet..."
There's a November 19, 2010 release for Harry Potter and the Deathly Hallows Part I, followed by a May 2011 release of Part II.
For me, it just highlights the ridiculousness of The Half-Blood Prince being held back until next summer. They'll have nearly finished this one by the time it comes out. The whole franchise is out of sync...!