Here’s a poster for the game provided by the Nariyuki Game Shop Blog:
As you can see, new playable characters Red and Morrie have been nonchalantly added to the rest of the cast artwork. The 3DS version also adds new scenarios, full voice-overs, and music by the Tokyo Metropolitan Symphony Orchestra.
The bottom of the poster provides some new screenshots:
Dragon Quest VIII is due out for 3DS in Japan on August 27.