Product images (including comparisons) and charts have been loaded on the Canon EOS-1D X Mark II page and much more information will be coming soon.
Links to the specifications, press release and preorder opportunities are also available on this page. Here is a comparison between the 1D X Mark II and the 1D X.
EOS 1D X Mark II Preorders: B&H | Amazon | Adorama | Wex Photographic | DigitalRev