This is just one of the few insight to the new electronic shifting presented by Shimano for 2012. Ultegra Di2 looks to be quite promising, with little compromise in performance, and a lot of money saved! Here's a video clip showing off the new 2012 Shimano Ultegra Di2
Yes, this was in Mandarin Chinese, but it does show you how well the grouppo works. Stay tuned on more news on this new grouppo from Shimano!