Are you sure, Timo? I would think that Paris-Roubaix is not a particular good testing ground for new technology. The race, I used to think, in many respects makes the pros go 'retro' (steel as opposed to carbon forks, strong as opposed to lightweight stuff).
Campagnolo shifting electronically? I have to check this out on Cyclingnews, the web-site that is usually quite up-to-date and keen on tech stuff.
Absolutely. There's a photo of the shifter on a Saeco bike in the Dutch "Fiets" magazine. They took the photo at the E3 Prijs Harelbeke. P-B was supposed to be an ultimate test and they even wished for rain.