According to Peter Sills of digitalfocus.net, Canon will announce an updated version of its EOS 1D digital SLR at the end of August.

“Canon will shortly announce a new camera, called of all things the 1Dx. According to our own sources, this new camera will be a refresh of the venerable 1D and will feature an improved 8 mpixel sensor, but the same FOV crop as the 1D. Framerate will remain unchanged as the camera gains double the number of megapixels.

Expected announcement is end of August - early September.”

Website: DPReview - Canon SLR Forum