I've seen the press articles about the new electric Shimano DuraAce before. As mentioned above, the racers seem to love it. I do all my own bike maintenance, and it takes a while to get 10-speed systems shifting perfectly, and they're pretty finnicky about staying perfect as well. Campy and Shimano needed to do something about the finnicky-ness of the systems as it would only get worse as more-and-more gears get packed onto the rear wheel (i.e., Campy has 11-speed rear cassettes now, which must be truly night-marish to get shifting perfectly). So from that aspect (i.e., ease of setup, keeping it shifting perfectly) -- I'm all for moving to an electric system.
I would be worried about what happens when the battery goes dead. From the original article, it appears that you can easily get 2,000 mlies while the manual says 600-something. Just have to get in the habit of re-charging batteries or carrying a spare battery with you. I've had mechanical derailleurs go bye-bye on me mid-ride before, so it's not like the old system was perfect either.
Basically, I think it's an intriguing breakthrough, with lots of upsides and not many downsides. I'm not about to shell out two grand for a little more convenience though.