I wonder if the pre-order exclusive bonuses aren't even really that exclusive. From what I've seen it looks like they are the same as regular weapons/armor in the game but just with better stats - except maybe for the Vault 13 suit.
No, all the armours +weapons are UNIQUE. The V13 canteen is also unique. Everything else in the packages are not unique.
I bet anything that all these "unique" items from "exclusive" pre-orders are available in any copy of the game by using a simple console command, at least on PC. I wouldn't get too worked up over the specific packages.
I pre-ordered on Steam, mainly because I figured if authentication and DLC are going to be handled through Steamworks, I may as well get the entire game from them and simplify the process. Of course, I would be lying if I said I wasn't a little swayed by the promise of binoculars.