Thanks all for the advice. I did read about the Quebec case which, as far as I can tell, means that any recognition of a person in the image means a model release. Wow.
It makes me wonder all the people who could be technically "sued" because of the images on the internet... and I'm not talking street photography per se but cell phone images, instagram, etc.
Anyways, from what I can read from all this, it sounds like it's still a bit of a grey area in that I'd have to justify it being "artistic expression" in the court if an action were to be taken... so it could go either way. I guess I'll just have to ensure I don't publish it and make it public record (aka sell the book in Chapters) and maybe just keep a copy for myself and maybe a friend or two...