I realize if you've been keeping abriast of the DLC speculation this teaser isn't telling you anything new, but it is confirming what was previously speculation. There are two risks you take if you get excited about unconfirmed information: first, it may be wrong; second, an announcement may not come with any "new" information because you've already ferreted it out.
Honestly I'd seen reference to Dawnguard before but even had I not...
this "DLC info" is particularly underwhelming.
w/e doesn't matter. More info wouldn't make it release earlier
I'm done for now. I'll be back on these boards after E3.