For people who watch this space and not the news area, Chris posted the announcement of the Canon EOS Rebel T1i D-SLR with HD. It looks like it uses similar compression to the 5D MkII. It offers 720p30 and 1080p20 - yes 20fps. If nothing else, it shows that the processor isn't locked to 30p.

http://www.dvinfo.net/conf/digital-video-industry-news/146553-canon-eos-rebel-t1i-d-slr-hd.html

Chris likes to keep the threads clean, so I recommend posting any responses there.