pepperland, for a split second I was going to protest your exempting Book from nakedness (Book is probably my favorite character and all), but then I thought about it and yeah. Book doesn’t have to be naked. (I’m sure he’s a fine specimen of manhood and is an awesome hunk for a guy his age, but I still don’t want to see him naked. 'Cause he’s Book, after all!) 
And I’m glad that it’s confirmed that he’s in the movie. Because a Firefly movie without Book would be terribly wrong.