I just called a Nokia sales rep in the US and she said they already started shipping the N900 a couple of days ago. I asked her about this "exclusively" thing and she said yes we are going to have it exclusively first but she didn't know exactly for how long. I also asked her if there are other Official Nokia retailers in the US that will have it earlier than others and she responded NO, only Nokia USA will have it at the beginning.

Not very good news for me but things are kinda starting to make sense now