Maybe there's information out there that I'm not familiar with (I hadn't heard about Abby's crew spitting on Joel's corpse for example), but I think there are some unfounded rumors floating around out there. Remember that there were other "leaks" a few weeks ago that have mostly been debunked. Unless it happens in the actual videos, or is confirmed by the level les somehow, I'm taking it with a grain of salt.
We know for sure that Joel gets beat to with a golf club, we also know that Jesse dies at some point per Dina's dialogue. Ellie and Dina get ed up pretty bad by Abby presumably at the climax, but Abby leaves the room after Lev calms her down. Ellie was still alive at that point though, Dina was unconscious but probably alive as well. For that reason, I'm assuming Ellie survives the game. A lot of the other stuff may still be true (Abby being the daughter of the surgeon), but I'm thinking some details are off.
It's obvious that ND is going for the "there are two sides to every story" angle. Joel admittedly robbed from and killed innocent people after the outbreak began. He went on a rampage at the end of the first game for his own selfish reasons, then lied about it to the one person he cared about. He isn't exactly a good guy. So they're seeing if it's possible to make the player witness Joel's brutal murder, and have you sympathise with his murderer later in the game. I personally don't feel like it'll work, especially if Ellie does die also, but it's a bold move. There are probably plenty of details that we're missing.