Wasn't it announced when the first generation iPhone came out that Apple wouldn't let a carrier sell the iPhone without an unlimited data plan? You were supposed to be able to use the phone to its full potential, and that requires unlimited data. Now, maybe they have relaxed those rules a bit, or Rogers has gotten around them a bit, but you guys are dreaming if you think you'll be able to get an iPhone without any data plan at all. You're also dreaming if you think you'll be able to get one for less than $50 a month. I'd put money on it being $80-$120 a month. As said before, Rogers has no competition in the GSM market so they can pretty much sell them for whatever they want.
Also, with regards to the 3-year plan, I believe (provided you are eligible for an upgrade) signing a 3-year plan will replace whatever plan you had. So no matter how much time you had left on your existing plan, it would be 3 years total, not 3 additional years.
I'd love to say that I'm getting an iPhone right away, but the if the plans are outrageous, probably not. Either way I'm waiting to see the new prices/plans for the Blackberry Bold as well as the iPhone before I make any decisions.