There's a theory going around that tied "Legacy" to "Legacy of the Force".
This is what I read at an ezboards forum.
According to issue #0, The Vong's shaping of planets was sabotaged... by the sith... but how would the sith know enough about Vong to do such a thing? Also, Darth Krayt looks a lot like a Yuuzhan Vong... but he is not SAID to be one, and I know that ommision proves nothing, but many other characters in this issue had their species spelled out. Additionally, it says that Krayt is ancient, and that he and the Sith have been in hiding for 100 years.. well 100 years ago is when the events of Betrayal go down with Jacen and Lumiya... and Jacen, as I'm sure many of us know, knows more about the Yuzzhan Vong than almost anybody else with the possible exception of Tahiri. Thus I conclude.. Krayt IS Jacen Solo.
Also I like what DH seems to have done, splitting the three youngest skywalker heirs (Jacen, Jaina, and Ben) into three factions. Ben obviously goes on to raise Kol Skywalker (look at the guys red hair and do the math on age.. pretty much perfect match) who then has Cade Skywalker. Ben's Legacy is the Jedi.
Jaina.. I am going to ASSUME here, hooks up with Jag Fel (who is seems becomes the first Emporer of the Fel Dynasty, again do the generational math). This explains why the current emporer Fel is a Knight and can use the Force. It also explains the Imperial Knights.. this is SOOOOO Jaina's style.. the Sword of the Jedi and all that jazz. She is all about being a good soldier and using the Force in her service, not sitting around and letting the Force guide her or seeking power of her own. I think that Jaina is the mother of the Empire and the Imperial Knights.
So we have Skywalkers at the root of the Sith, the Empire, and the Jedi if my guess is at all right. Three Skywalker heirs, Three Galactic Factions and Force Traditions.. beautifully done DH, I love it. Of course I could be way off in all my assumptions, in which case I still love it.. surprise is NICE! I have been waiting for this series for so long and have only now come back to look at the boards, I was getting way too sick of people condemning a work that they hadn't even seen yet, I hope that all the positive feedback will make up for it guys.
Interesting theory, but seems a bit too deep. Jacen was born a bit earlier, though.