Interesting... not sure when this happened, but I happened to notice that on my TiVo Roamio as well as my TiVo HD (both with cable card and tuning adapter), tuning to the "analog" channel number automatically tunes in the HD channel. For example, tuning to channel 2 gets you WTMJ in HD; channel 6 is WITI in HD; and 41 is Discovery in HD.
It isn't all of them. For example, 54 is still standard definition Comedy Central, and 12 is still WISN in SD.
Still, this is a bit of a taste as to how the new system will work with the new lineup, whenever it shows up here.
Are TWC set-top box users seeing the same thing?
Edit: *not* seeing the same on the DTAs. Not surprising; they probably assume that the DTA are standard definition devices, despite having a HDMI port and being capable of displaying HD programming.