Davina Claire could return. In an interview with Clevver News, Narducci stated: "I think there is also a question to be asked when it comes to Davina, which is, does a New Orleans witch ever truly die?" Narducci then went on to reffer to the fact that Papa Tunde, Genevive and Sabine all returned after death. Narducci then mentioned: "there may be another glimpse of Davina's fate."
There will be a wolf attack in the first episode. 
This Season's Theme: "This season is all about putting family love to the test by introducing something that is scarier and more evil than they are,” says showrunner Michael Narducci. “And that thing is threatening the most vulnerable member of their family, their daughter."
Coming Up: The season begins with a five-year time jump, during which Hayley and Hope have been on the road. "[Hope] is now 7 years old, she is smart, she is savvy, she understands what magic is and that she is extremely powerful," Narducci says. "She has this curiosity about who her dad was, and is and will she ever see him again?" Meanwhile, Hayley's been tracking down the missing werewolf clans to find the cure, and new character Keelin (Christina Moses) may be the key.
Daddy Dearest: With Hope becoming a major character this season, her relationship with Klaus will be focal point. Says Narducci, "Can Klaus Mikaelson, in good conscience, be a father to this very powerful young witch who needs guidance and who needs a dad?" — KW 
How might The Vampire Diaries‘ series finale connect to the upcoming fourth season of its spinoff, The Originals?
“After you see this finale, and when we get to The Originals‘ finale, that question sort of answers itself,” she tells us. “It sets the stage for either the future of The Originals or another piece of The Vampire Diaries universe. Whether we get the opportunity to go down that road, I have no idea. But it definitely opens the door for a nice iteration of the two worlds.”