Overall I think the demo is pretty good. I just wish there was more campaign stuff like in Age of Kings demo.
The other things I noticed are interesting:
1)It seems like they added to many extra useless units just to make it faithfull to the movies and the expanded universe stuff.
2)Possible episode 3 hint...If you select Leia's campaign in the campaign section, it says that she is meeting with a Bothan spy to get the death star plans. I am assuming that means that we don't see that happpen in episode 3.
The rest is good, although I do find myself building up huge armies for no apparent reason.