Are you serious, how on Earth can you make that call?
I'm pretty sure they mentioned it somewhere in the article.
Also, why wouldn't they show off the console version first? After all, that's their primary market with the game, so why show the game at max settings knowing the majority of players won't ever get visuals as good as the previews?
It's basically the same marketing technique as Fallout 3, as all screenshots released by Bethesda for that game came directly from the Xbox 360 version.