Latest spoilers, some we've already seen:
"Bonnie dies but is reunited with Enzo in her world. Hell is destroyed, all those seeking redemption, i.e John, Jenna, etc. go to Bonnie's dimension. Damon compels Elena and Stefan to forgot about him, Caroline, and each other so they can live out their human lives. Caroline works at the school with Alaric, and receives a letter from Klaus (JoMo was in studio for a voice over), multiple sources have said letter leads to a KC endgame. Matt is alive and is married with kids (mentioned, not shown). Damon lives but is all alone at the end. There will be a flashforward of about 3 years. And Katherine is locked in the prison world with Kai."