IGN, Destructoid etc have seen the game and they are all REALLY freaking impressed.
From PSBlogcast
-They want the quiet to be creepy, they want you to hear every footstep,voice and breath to find out where the enemy is.
-The build was from January
-They are not going to have cursing and violence for the sake of it
-The AI will behave differently based on number of people left and what weapons you have or they have. So if one guy is left he will be really scare and hide, so you have to fine him.
-Ellie is 14
-The want to make Ellie capable, she can get into danger sometimes but she can take care of herself. She helps you get out of rough spots.
-They want to give a certain amount of strategy in combat
It less linear than UC but not open world. (MGS anyone?)
Destructoid =
"After seeing this, I hope Naughty Dog fans are not expecting anything like Uncharted, as this is completely different. Forget platforming and rock climbing to pretty locales so that you can shoot enemies from a distance. This is violent, close-quarters combat in a tense world where you're forced to creep around to survive. This game may be just as beautiful as Uncharted, but you'll be too busy striving to survive to stop and enjoy the scenery. That said, it's already clear that we can count on more of Naughty Dog's impeccable storytelling and deep characters.
I was already quite excited for Naughty Dog's take on survival action, but after seeing this first gameplay demo, I'm practically vibrating with anticipation. They promise a brand-new look at the game at next month's E3, so stay tuned."
IGN =
"The team wants us to share the emotions of Joel and Ellie, and from the brief demo I saw -- filled with scavenging for bullets, a segmented health bar, and other humans being a larger threat than any monster -- it's working in a way Uncharted never did."
Twitter of Greg Miller = "Just saw The Last of Us, holy shit"
