I've received a few pieces of info for an announcement in the middle of July. It appears July12/July 13 or July 19/July 20, we haven't nailed it down exactly yet. More will come soon.
There will be a 2nd announcement cycle in August.
There will probably be a DSLR announcement (60D/3D) as well as other cameras and accessories. Do not expect a 1Ds Mark IV at this time.