Here is a replay of the live demo and Q nA session

http://uk.ign.com/articles/2013/05/24/watch-the-last-of-us-livestream

How long?

A couple of minutes if there are no delays.

Also note guys, that "The Last of Us" demo button in GoW Ascension is gone. Makes me wonder why.

The live stream just showed a bit of gameplay after the trailer when they are ambushed in their truck. Then the q and a came which was interesting, but no new info as far as gameplay. Well there was a small mention of the choice you can make. For example, if you see an enemy begging for their life, you must kill them. They originally had that choice in game, but didn't really work with the narrative. Unfortunately still no new info on the multiplayer.

They mentioned during the q and a that more info on it will be coming soon. They also said, they wanted to incorporate the feeling of the campaign into the multiplayer mode.

MP is still alive but they are saving it for "soon" (I assume E3)
They want to translate the stealthy, tense and nervy feel of the single player into the MP.

Since the single player is what (I assume) everyone will be getting the game for, whatever the multiplayer offers will be a bonus.

Though there is a 2 week gap between E3 and the release so...yay?

http://uk.ign.com/articles/2013/05/24/watch-the-last-of-us-livestream

replay of the live demo and Q n A show from IGN