"Shimano look to have raised the bar once more, with the long-rumoured Ultegra version of their Di2 electronic road groupset due for release this winter. This second-tier group is expected to be around half the price of the flagship Dura-Ace set – which, although lauded for its performance, has been out of reach of most riders due to its prohibitive pricing"
http://www.bikeradar.com/news/article/shimano-ultegra-di2-first-look-30616