Knowing who is in the movie isn't really going to make the movie come faster or be a TRUE indication of if it's worth getting excited over. Look at the amazing cast assembled for the PT. Ewan, Liam, Natalie, Samuel L., Christopher Lee, and McDiarmid
I think the most exciting news has already been officially announced: JJ Abrams as director (I have faith in him to do it right based on his passion for SW and his work on Super 8), Michael Arndt as screenwriter (Toy Story 3 in my opinion is one of the best "many years later" sequels made and it was the third in a series at that!), and John Williams as composer (the score is as much a character as Luke Skywalker is or as the Millenium Falcon is).
I'm more interested in knowing if they plan on retconning the EU or if they'll just set it 30 years later without any real references to that lost chunk of time. Unless it REALLY affects the story George's outline included, I think we'd all be happy if they ignored that lost time. Of course that means no Chewbacca.... And it forces any future generation of Skywalkers to already have an established history/upbringing.... We will see.