The CW has released the synopsis for the upcoming 8th episode of this season. It seems we are about to learn more about Kai and his past:
FRIENDSGIVING AT WHITMORE COLLEGE / FLASHBACKS TO KAI’S MURDEROUS PAST — As Caroline (Candice Accola) and Elena (Nina Dobrev) prepare to host Friendsgiving at the dorm, they receive some hopeful news from Alaric (Matt Davis) and Stefan (Paul Wesley), who have traveled to Portland to gather some information regarding the Gemini Coven. Tyler (Michael Trevino) is determined to help Liv (guest star Penelope Mitchell) after she and Luke (guest star Chris Brochu) reveal some disturbing information about their witch lineage and the impending plans their coven has for them. Meanwhile, dinner takes a drastic turn when Jo (guest star Jodi Lyn O’Keefe), who has revealed some painful details about her past, finds herself fighting for her life, leaving Alaric scrambling to help from a distance. Finally, Kai (guest star Chris Wood) makes a dangerous discovery that brings him one step closer to his release. Ian Somerhalder and Kat Graham also star. Joshua Butler directed the episode written by Nina Fiore & John Herrera (#608). Original airdate 11/20/2014.