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@Dammit
Nope, Dura Ace Di2 is simple signalling, Ultegra Di2 is [ame="http://en.wikipedia.org/wiki/CAN_bus"]CANbus[/ame]
105 would undoubtedly be CANbus also, and DA 9000 Di2.
So, if you are interested in "hacking" your groupset, DA Di2 is the one to get- custom battery packs etc.