Well, folks, I just feel it's my duty to chime in. I read the book (I wasn't going to, but then I went and did.)
It's not QUITE as dark as ESB was, but it's certainly substantially darker than TPM was. There's a few good twists in store (especially with the whole Boba Fett thing), and the action will be excellent.
One little thing I'm worried about is there seemed (from the book) to be too many short action sequences. Hopefully it won't seem that bad in the movie.
Oh, yeah, and with the way Ep2 ends - Ep3 is going to make Ep5 look like it's a bright, shining jewel of a happy movie. (-:
I wait with bait-breath. No, wait, I think I screwed up that phrase. [grin]
--TurboNed