Honestly if they did another batch I would like them to do it way in the past, like an origins of the Jedi Temple story, or way in the future.
I would like to see new characters and stories.
Especially with the way the prequels were handled, they didn't do a spectacular job of tying the stories together or letting the new stuff stand on its own. At least not for me.
The only thing with creating a Sequel or a new Prequel to the current Star Wars saga is that Lucas intended the Star Wars saga to be about Anakin. The Story is about Anakin.
So either Lucas would have to think of how to show Anakin after death for 3 movies (or however many) or before the Prequel trilogy.
I don't think any more movies should be created. I think The Clone Wars is a good idea as an extension of AotC because it tells the story of about 5years that's completely missing from RotS.
If anything, a movie about non-Force users would be interesting. Showing the background to the Star Wars universe, the majority of the people. According to everything to do with Star Wars and the Force, Force sensitive individuals are few and far between at any time, and yet for some reason there's a high demand for a vast minority.
I really think they should take one of the best Star Wars fiction books and do a one-shot adaptation. And yes, something darker that isn't primarily concerned with selling goddamned Lego sets to kids. A REAL story with REAL characters and some realistic violence. I mean, it's called 'Star Wars'....WARS! I want to see more of this 'War' part of the title! Something like 'Saving Private Ryan' in the 'Star Wars' universe would truly be amazing