Shimano is offering their electronic Dura-Ace group from January 2009 “… as an upgrade option within the 7900 group”, with no word on pricing yet, and much earlier than I expected.
UPDATE: Cyclingnews have some coverage of Dura-Ace Di2 now, including UK prices. Expensive stuff indeed.
Author M. G. Liebach
LastMod 2016-05-01 (9fc4632)