Looks like a loser to me. The advanced amateur will not like the slow lens. For a fixed FL, f4 is unacceptable, unless high ISO performance is very good, even then DOF control is difficult.
Digital zoom? What advanced amateur or pro really wants that? What occasional shooter, i.e. Joe Double-Double, wants a digicam without a zoom lens?
IT IS BUTT UGLY. OK, so was the Argus C3, which didn't keep it from being successful. I'm sorry, but adding the hood and external vf helps ... very, very little for me. In the effort to produce a clean, minimalist design, they left out the design part ... no styling cues, just a beveled edge added to a stock rectangle.
$600? No way. Soon I'll be able to buy a current production 4/3s body for about that, maybe a bit more and have a mount that is flexible ... I'll be able to mount classic fast primes and from the sounds of it the manual focus on such a kit will be better than the focusing options on the DP-1. If I want a somewhat larger sensor, then there are other options. But 4/3s is looking better what with the announcement of the E-510...