The scene takes place at Tommy dam one night 4 years later. Joel talks about how Tommy trying to get Joel hitched to a girl named Esther. El lies acting fairly distant, probably conflicted about joels lie. Joel then said he has a special gift for her and busts out a guitar. Then he plays a special song for her. Then he gives her guitar and promises to teach her. The scene ends with her striking a note on the guitar
edit: another gaffer's impressions
Neil also said before the scene is a goodbye to Joel and ellie.
So the big surprise wasn't TLOU movie teaser, UC4 gameplay, or a freebie to take home. It was a deleted scene acted out. It was from AFTER the final scene in the game. In the scene, Ellie is in her room at Tommy's place, listening to her iPod/CD player etc. Joel enters the room and wants to talk to Ellie. He brings out a guitar and sings a song(Troy Baker played the guitar AND sang in the voice. Fucking amazing). Joel shares a joke that he tells Ester, a woman he's now dating from the camp, with Ellie. "What's the bad thing about eating a clock? It's time consuming." They laugh, Joel leaves the room, and Ellie strums a string. End scene, end journey...perhaps.
Also, we got a free copy of Gustavo's recent CD and the cool German exclusive steel book. What an amazing night. :)
Neil said that this will never ever be released, and asked that no one film it. It was pretty cool.