I've just watched on YouTube: http://www.youtube.com/watch?v=xuk53Vv6yHk
At 0:54, Matt Firror talks about ESO getting DLC in the future.
More additional fresh content is always good. I hope it will be worthy story based DLC, as opposed to "Horse Armor DLC"
I guess they will have to be purchased, as using the term DLC usually implies it.
That's the only real new info (at least for me) in this video.