My dealer had at least 3 or 4 orders for it and there was another member on the other Z forum who was told 17 were ordered through that dealer. So just from that alone I'm guessing there will be substantially more then 150 cars delivered to Canada.
I placed my order Jan 26th through my dealer filled out the form you mentioned and received my confirmation email from Nissan shortly after. So I don't think it has anything to do with ordering online or not. I would imagine everyone will get that email.
I talked to my dealer yesterday, he said their GM was told by nissan that specs should be released in the next few weeks, if I had to guess it may be close to the Z making an appearance at the nissan display in Toronto on Feb 3. But who knows maybe a few weeks actually means 6...