Depends on what cameras the coverage unit brings. The Bears were covered locally in HD, and NFL Network used their coverage.
If the schedule here is correct, the KC-AZ game is not HD [KCTV-5 covers]
http://www.dbstalk.com/showthread.php?t=135024
EDIT: later showings of the KC-AZ game have an [HD] after, so I guess that's no help.