I went to the store of a major retailer that also runs a major online camera/electronics site (One Call) at 1:00 PST, and they did not know what the camera was going to retail at, nor what dealer cost is going to be. The sales guy checked their internal pricing data base and could only tell me "it may be around $3500" retail. That may be where it ends up, but he clearly did not know for sure even now. He didn't invite me to "preorder" at that price, even though he knows I'm a serious buyer.
You're talking about one salesman at a shop, and I'm sure he'll tell you tomorrow that you can preorder for $3500. And do you have a personal relationship with these people or are you just another customer walking into a photo store? Is this store one of the 17 stores that Canon chose to carry the C300?
In my situation, I know the people at the shop very well, and have spent over $20k there in the last year. They are also the biggest canon dealer in Georgia. They didn't invite me to do anything, I went in there with $4k and demanded that I get one of the first ones they get. They wouldn't take my money, but they put me on the list. I asked if they thought it might be any cheaper or more expensive, and they said no, not to worry because they already had the SKU in the computer for it, $3499.99.
People have been saying $3500 all over the web and they said the same thing, meaning that is the set price until proven otherwise. I go to the shop, and they say $3500. If that's not enough for someone to believe that it's going to be $3500, they must really really want it to be cheaper. See when you really want something, you'll cling onto any little shred of evidence that you may be right. Even if you read 10 articles contradicting your belief, you'll only focus on the one article you found just to hold on to that little piece of hope. It's called confirmation bias, and if you have a brain this affects you, and that's ok, it affects me too. But in this situation I am indifferent, if it cost $4000 I wouldn't care, and if it cost $3000 I wouldn't care.