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*** Important notes regarding usage of the 11 speed M9000 cassette ***
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see:
http://www.cxmagazine.com/shimano-xt...ible-questions
Apparently the 11spd, 11-40 M9000 cassette will fit on 10 speed hubs (or 11 speed hubs with a ring spacer)! As bizarre as it may be, Shimano made this cassette to be 10 speed hub compatible - for obvious reasons - adoption by ppl with 10 speed mtn bike wheels.
As far as 11 spd mechanical road shifters and derailleurs goes, you are stuck with using only the road components together. The m9000 derailleurs have a different cable pull which will not work correctly with road shifters.