Agree, and it doesn't make sense to me that Bethesda would release a Full DLC of game-content, quests, etc for only the 360/PC. They have not done this before with Fallout3 and with GWFL gone (and thus less control by Microsoft, not more), I really do GECKulate that this is a combination pre-order pack - and nothing more significant than that.
I very highly doubt that. Whatever the DLC will be, the way GStaff's post is written, it will be only for XBox, forever. And I highly doubt that a combined DLC of the pre-order fluff would be it.
Not for PC, or PS3, ever. Not very cool, this trend has been showing up a lot lately, and I think it's pretty chintzy. As a player, regardless of my platform of choice (PC for me), I want the opportunity to experience all of the official content.
Exclusivity release deals to fuel console-war sales is just a huge noxious pile of crap that keeps wafting up in my face.