The Hookup™:
http://www.howardforums.com
(Best cell phone discussion board in the world, been going there for about 3 years now. In fact, right this very second there are 7526 people logged in. They had over 22000 people logged in at the same time last June. There are carrier insiders, high profile users, a bazillion tips for getting better plans, upcoming hardware leaks, etc etc etc.)
(In other words, lots of +info.)
(...and they have a thread on the iPhone in the Canadian Carriers - Rogers section. Albiet not much more info, but if there are any leaks on plans/pricing, chances are they will be posted there before they're posted anywhere else.)
(Parenthesis are win, btw.)
(Tip: Start at the end of that iPhone thread, not the begining. It was originally a "leaked info" and "rumours" thread and they just merged the "fact/announcement" thread with it. If you start at the begining, you'll have to sift through a hundred pages of crap to get to the relevant stuff at the end. I have no clue why they did that. I really wish they had the mods we have here. Anyway...)