Yeah , I was disappointed to hear this is focusing on prequel area characters too . Although , Dave Filoni is helming the show and he played a large part in bringing a lot of EU characters and concepts back into "canon " . He has also been known to play his cards close to the vest and not revealing things to the public and sometimes his own crew . I don’t think he would have used that specific title , that specific logo for this show without some kind of connection . Going by the original Tales Of The Jedi comics , the sprit of Exar Kun is still trapped in the temples of Yavin 4 in the time period this is set in …while things probably won’t play out the way they did in the EU , I could see an eventual reworking of some of the events of the Jedi academy trilogy or I Jedi , where Exar’s spirit is discovered and dealt with ,being transposed to this time , with it being these prequel era Jedi that have to deal with him .Thrawn was brought back into the current stories , so I think anything can happen .I would like to see this series get more than one season and end up heading this route and leading to something bigger . I am selective in my reading of current Star Wars books and comics and not fully up to date on "canon " , has Exar Kun been referenced at all in the modern materials ?