Weren't the McLarens, Brawns, Red Bulls, Ferraris and Renaults all fitted with higher quality (HD?) on-board (cockpit) cameras by the European GP (possibly earlier; I don't really recall when I first noticed the difference and I can't be bothered whipping out the season review just to check).
The difference between the on-board cameras of those five teams and the other five was night and day. When watching any of the other teams' on-board shots, it's like you were watching something recorded with a 10-year-old video camera on an equally old TV and VCR.
Even if the track and helicoptor cameras aren't in HD, I'll be satisfied as long as every car gets fitted with high-quality on-board cameras.