Guys: The real importance of this is twofold ...
1. The Vario Elmar in 4/3s mount. I assume there will be other Leica lenses in Panasonic's lineup. You can use them on any E-series body, including the E-330, which is different because...
2. The E-330 will have a hinged, highly maneuverable LCD with Live View. Hence, it will provide more flexible shooting for situations such as macro, over the crowd, candid, etc.
The porro-prism design makes the two-sensor capability possible, hence the "live view" capability.
The only things lacking in the E-330 and the Panasonic, IMO, are weather sealing (available in the E-1) and image stabilisation. I can live without both, but if Olympus (or Panasonic) comes up with both in an SLR (or RF!) design, it will be killer.
The other thing I note is that the Panasonic marketing blurb says the camer is designed along the lines of an analog camera. Now THAT is interesting.
I've been intrigued by the E-330 (not yet shipping AFAIK), considering getting it to use with OM primes before splashing out for a digital-specific lens. With this announcement, there's another line of lenses coming on stream. Yowza.