Grumble grumble I'm not entirely sure this is worth a post grumble grumble. It's a CGI-only, bizarrely slo-mo and semi-silent glimpse of the main factions in Bethesda's confusingly non-Elder Scrollsy The Elder Scrolls Online. I'm interested in the game even if I'm currently bewildered by how little it sounds like its singleplayer parent, but this trailer is about as illuminating as a conversation with a Scientologist.
What you're looking at there, in order, are the Ebonheart Pact, the Aldmeri Dominion and the Daggerfall Covenant, which between them boast all the familiar TES races, conveniently set against each other for the purposes of PvP'n'stuff. I'm going to call them The Thumpies, The Magicks and The Stealthalots, I think.
More - and more revelatory information - on TESO soon.