I just read up on Atha Prime. No offense, but sounds like a pretty boring character to me. The whole series has ultimately been about Sith vs. Jedi, so the last thing I want to see is some warlord-type non Sith trying to re-establish the Empire.
I'd like to see the trilogy focused on:
- Luke working to re-establish the Jedi Order
- Leia and Han trying to restore the Galactic Republic & Senate
- The antagonists being the One Sith who have been hiding out and training on the Sith home planet of Korriban
If you think about it, this would be the perfect time for a Sith army to mobilize & reveal themselves. The Empire is broken and leaderless, the rebellion is still small, wounded, and too new to restore the republic, and most worlds are probably feeling isolated and on their own. The Sith could take a page from the Vong invasion and start conquering outer rim worlds without much retaliation. Depending on the timing, it could be up to a small restored Jedi Academy to help fend off a massive Sith invasion, which would make for some pretty amazing battle scenes. Imagine multipe sith vs. multiple jedi at one time or space battles with jedi vs. sith pilots. Lots of room for new characters there too.