6. Count Dooku
You might think that Lucasfilm and J.J. Abrams would do everything in their power to avoid referencing the prequels, seeing as the majority of fans hate them, but it sounds like Star Wars: The Force Awakens will find a way to make them relevant to the events of this new trilogy. That will include having one of the lead villains be related to Count Dooku. Two of his possible heirs are the characters being played by Adam Driver and Gwendoline Christie. In the case of the latter, she's rumoured to just be a descendant using his name to earn respect in the Empire, but Driver has been described as a rich aristocrat obsessed with Sith weaponry, something which obviously clashes with the rumour that he's a Solo.