I think Petroglyph should avoid the Nagai/Tof War, but I might like to see the Battles of Kashyyyk and Kessel from Galactic Battlegrounds. Maybe Kyle Katarn could have a role in the campaign as Jedi Knight happens at this time as well. I'd like to see the Thrawn Campaign and Dark Empire be in it too.
I think the Imperial Remnants will be a neutral faction like the pirates. I'd like to see the pirates and random events return. As Rogue Squadron will likely have a large role in the campaign, I'd like to see them beefed up. The events of Courtship of Princess Leia will probably have some role, but what I'm not sure.