Highlights from the AMA so far:
Q: What was your initial reaction to getting the script? Did you rage at it?
A: Nope. The script was cool. I told my editor(s) that if the movie came out as exciting as that script was, it'd blow The Empire Strikes Back right out of the fucking water.
Q: What was your opinion of the film?
A: I thought it was the highest-grossing film of 2005.
Best non-answer answer ever.
Q: What did you think of the Star Wars prequels?
A: My feeling about the prequels are mixed -- very much like everyone else's.
Q: What was it like working on something as vast as a New Jedi Order novel? Were you provided kind of a 'big book of njo' to keep up with canon? It amazes me when I think about trying to write in that setting.
A: I was given a series bible, a cartload of reference books and copies of each book as it came out. The near-impossibility of keeping up with an always-evolving canon was part of why I pitched that particular approach to the story -- so I wouldn't have to keep revising to incorporate new stuff. I also wrote the book very fast, figuring that once my book was approved, the other writers would have to worry about keeping continuity with my book.
He's being understandably cagey about what questions he answers and how, but those were the best I could find on a quick skim.