from what I have been researching recently because I was trying to find a disc road shimano hub (not a lot out there).
shimano mtb 11 speed is same space as 10 so it works on 10 speed hubs but the new 11 speed mtb cassettes start at 40T biggest cog.
and as mentioned 11 speed road wont fit on 10 speed hub, you won't be able to thread the lockring.
edit -
http://www.chainreactioncycles.com/u.../rp-prod135828
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