All in all, there will be at least 5 screens (3 English, 2 French) in HD everyday from 06:00 to midnight with one hour news break at 18:00. There will be nothing but the Olympics all the time. And since CTV owns all of its stations, there will be no need to shift the broadcast back to the affiliates during the day like NBC did in Vancouver. Because of that - just like Vancouver - I think there will be much more live events on CTV than there are on NBC.
I wonder if the NBC stream will be available internationally? (It won't really matter to me. CTV/Bell Media is pretty much awesome if Vancouver was any inclination. And all I'd want to watch - Gymnastics, Fluffy pieces, Swimming), will be prime time with Costas anyway.
It will not, to my knowledge. Each country has their own rights holders for the Olympics, so they'll have whatever measures in place to make sure you're watching that country's feed. I'm not sure how the whole NBC authentication deal will work, but I imagine it is possible based on that you'll be able to see NBC video elsewhere. But I wouldn't count on it.
The only reason NBC (the broadcast channel) is not blocked in Canada during the Olympics because it can not be. Since some people can get the signal OTA, providers can not block them. All other media will be blocked, including on the net and on the cable. But it is not just the Olympics. Almost all shows that have their rights also owned by Canadian broadcaster are also location-blocked. However, of course there are ways to circumvent the location block.
As a side note, Olympics coverage through cable channels is also blocked. During Beijing and Vancouver, MSNBC in Canada aired marathon of Lockup everyday.