F***ing forum ate my first reply.
This right here might be an indication of them wanting to retain the CS and C, this is in no way a replacement for the CC market. The CS and C compact in particular are much more suitable in size for concealed carry, which makes sense since the HD series is being marketed as a duty platform.
Last night I did a side by side of my C24 compact and a bare backstrap G19.5. My perception is that the G19 is smaller, but that may be grip shape. Because of that, I want to see how the P4 fits me - but pics like these considerably cool my enthusiasm since I really have no need for a duty sized 2011.