With regards to Multi-Tasking Window, you will need to wait for a software update to be released. As I am an user of the International Version (N7100 & non-LTE), I was able to catch this feature thru XDA. Which is one of the benefits through those forums.
Keep in mind, when AT&T in US release there version in USA. I believe people are still waiting, if you want to root your phone and install custom ROM, then you can get the feature, I am sure one of the developers of XDA forum will port-forward the feature, since the AT&T version is the same as Canadian.
If interested, keep an eye out on this forum: Click Here!
If you want more information, you can read about it here: Click Here!
I walked in to Coventry Hills FS on Friday around 6:30pm and they had 2 Note 2 in the cabinet... the girl said it's been there since 2pm.
Next mission... find screen protector and case...
still waiting to hear ANY news on my upgrade i did over the phone on the 30th. today i was at best buy (ottawa) and they had telus note 2s