As a follow-up to the successful graphic novel adaptation of Fahrenheit 451, Bradbury has authorised new graphic versions of two other books. The Martian Chronicles and Something Wicked This Way Comes are both due out in the middle of 2011 (as I reported back in December).
Publishers' Weekly has published previews of several pages from each volume. Click here to view them.
I'm not entirely sure I care for the visual style of these adaptations, but I will reserve judgment until I've seen the complete volumes.