Banes full story. That trilogy of books were some of the best SW books I ever read. I love the way Bane went from nothing to being the single handed destroyer of the Sith order at the time. Also the story of Darth Zannah was quite intriguing and it would have been nice to continue her story after her defeat of Darth Bane.
http://starwars.wikia.com/wiki/Darth_Bane/LegendsYES! Oh Hellz Yes.
Just Old Republic stuff for me.
Also yes.
Personally, I would like to see the original Solo kids and Mara Jade returned, but Disney done f$#@ed that up already.