I think the point here is to get the video to the second TV in HD. That is currently not an option.
Technically you could wire two HD TV's from the TV1 output (1 using HDMI, the other using component) to get HD on 2 TV's. I think the bigger issue is not just to get video to the second TV in HD, but to get HD to any TV in the house, independently of what other TV's are doing.
The ideal (or close to ideal) situation would be if every TV in the house could access any program on any DVR in the house, with all recorded programming, from all devices appearing in a common, easy to navigate catalog/menu. Recording would be just as simple - pick a program and the system would automatically determine which DVR has the available slot, the most space, etc. and set the timer from there.