I actually watched it live, as i was working.
They didn't show anything new; i mean they showed new footage, but it's basically more of what we already saw, Ellie sneaking around for 10 minutes killing people in a rainy overgrown urban area.
The only new thing is they switched around pushing boxes and ladders with ropes you can climb, and that clickers/zombies and NPCs can finally interact/fight and be in the same area.
The game looks very good, animations especially, but it was very much pointless as a State of Play in itself.