I think you need to have the whole Di2 grouppo to have it work. I've heard there's going to be an Ultegra level electronic group coming out eventually.
As for new Ultegra (6700), I find the inner lever a bit "mushy" feeling compared to old Shimano, but I don't think the lever throw is any more difficult than DA 7800. I had a really hard time with older 105 (I'll admit that the newer black colored 105 is a little bit easier).
As for functionality, Ultegra 6700 is much closer to DA 7900 than older Shimano groups were to each other.
I think the best way to get around lever throw issues for small or weak hands is to go with SRAM, but I don't know what Campy is like these days.



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Dang... 