Well, I agree that if these type of trailers is all they showed, it would be pretty ridiculous.
Up until this point, though, they have multiple in-game footage trailers, and even 40 minute demo walkthroughs of the game as well as many "hands on" videos. So, there's probably more in-game footage of Skyrim than any other pre-release game out there.
This is probably going to be the last new video footage of the game before it releases, probably meant to hype up those who are already hyped up about the game.
“Anna, my strong, terrifying Anna.” -Cas
"You lack the requisite spine and testicular fortitude to study under me" -Elodin