Well, I think both Shimano and Campagnolo have been working on these electric systems for many, many years now. For years, people have been speculating that they would start selling such a system "this coming fall", but it never happens. My feeling is that they are both in this mostly to hedge their bets, so that they won't be caught off-guard if either one of them actually takes their system to the market.
On the other hand, I am fairly sure their market research keeps telling them that electric systems are not worth the bother at the current state of the art. These systems are going to be ultra-high end, correspondingly expensive, and they all come with a significant weight penalty. I don't think the potential benefits they can offer at this point are sufficient to offset these negatives. Who knows, maybe some day, but I won't hold my breath.