-First 11 spoilers are from the CW employee named Christian Waston, who posted it on his facebook account
Other, 12-14 are the spoilers from different sides, but they are confirmed; mostly from Julie Plec.
''1)A big Klaus and Tyler fight is coming in Mystic falls.
2)don't expect Katherine any time soon, cause they have informed me that the writers are not planning anything for her just yet.
3)I can assure you that there will be a lot of romantic tension between Delena.
4)Sage will help Damon figure out Rebekah's latest agenda, related to her discovery of the white oak tree that could kill her and Klaus.
5)There is gonna be some jealous Elena in the corner watching Damon dancing and flirting with Sage and Rebekah.
6)I am in shock, just finished reading TVD finale script, i can't believe what happened, i think some fans will die untill season 4 comes. Elena will definitely make a choice.
7)One big OMG fight moment with a tragic end, and a huge twist by the end of the episode(although there might be some changes on the script)
8)Alaric is alive and Meredith is not the serial killer. Someone else is.
9)When The Vampire Diaries flashed back to the early 1900s to explore Stefan's ripper origins, Damon was very much absent from his brother's life. When the CW series travels to that era again, viewers will see exactly how the rift between the Salvatore boys was created. It's episode 3x16 guys.
10)TVD finale date 10 May!
11)Another school dance is coming and no one is safe till the season finale.''
12)Damon and Elena & Klaus and Caroline will hit the dance floor in ''twenties decade dance''
13)someone unexpected will save Klaus's life and Caroline will play a big part in this episode.
14)Klaus definitely presents a seductive allure for Caroline, but she claims her heart belongs to Tyler — and in Episode 20, at the school’s decade dance, we’ll see that put to the test.