It's all going to be 720p30 headed for broadcast
You sure about that? To the best of my knowledge, 720p/30 is not an ATSC standard. It's an 'off' mode invented by camera makers, but isn't part of either the broadcast or the Blu-ray specs. Normally, you'd need 720p/60, or 1080i/30.
In any event, CS6 has something of a fatal flaw with spanned AVCHD media. You should test a long clip from the camera, as you may end up using CS5 for this project.
Thanks for the suggestion, Jim!
30fps in any event was what was specified (maybe the 720p60 rec format at 29.97). I'm used to shooting 24.
With CS6, the only limitation to multicam sequences is what your computer can handle - I will say that 8 AVCHD clips at once will be taxing.
Having more RAM than you might think you need, a very strong video card, a fast processor, and a fast storage system for your media will be best.
In regards to issues with AVCHD footage - Jim is right. Best to do some test footage before the event to see if the footage will work. If it doesn't work, then you will want to transcode your footage or use different cameras - CS5 is limited to 4 cameras.