The 9D hasn't been used yet...
1Dx - Pro FF 18mpx fast framerate good autofocus etc, mid range HD video
5DIII - Studio FF High mpx slow framerate basic autofocus etc, mid range HD video
7DII - APS-C high mpx fast framerate, mid range autofocus, basic HD video
9Dx - The new 5D classic, FF 18mpx from the 1Dx, slow framerate, basic autofocus, basic HD video
High end HD video covered with separate range