Didn't know they were actually working actual legitimate work on a Hitchhiker's Guide to the Galaxy movie, but there you go. That up there is one of the prototype design ideas from the Jim Henson Creature Shop for ol' Marvin. (It should also be noted that no matter what design is finally chosen, it's going to be around three feet tall since Warwick Davis will be in the actual suit.) I dunno; I always considered Marvin to be a tall junkheap of a robot who schleps around. This looks like Marvin crossed with Gir crossed with an Aibo (sup babs).
The page I found this at (Opera really doesn't want to render the text on that page properly) is also reporting that Martin Freeman, of the British sitcom The Office (don't remake it, American networks, you'll only mess it up something fierce) has been cast in the role of Arthur Dent. Interesting. Here he is in a publicity shot for The Office:
Now just imagine him in a bathrobe, I guess.