The unsubsidized price is US$529, but it operates on a frequency band that is incompatible with the Rogers 3G network, so that won't really help you Canadians, eh.
I was looking at WINDs pricing, and the unlimmited only seems to be in WIND home areas, and [for the time being] that didn't seem very large.
Also, while it looks like it will work on WIND, it won't be able to roam on Roger's 3G, which seems like it would be useful until they have a more complete network roll-out.
Even when it is available in Canada, my main concern will be who is going to offer it, and how outrageous will the pricing be. After seeing the way Rogers has handled the iPhone (Apple was a willing accomplice, to be fair), I figure it can only get better.