Originally Posted by
HTupolev
The front shifter, front derailleur, and crankset would most likely work fine with the 11-speed chain.
According to Lennard Zinn (at VeloNews.com), who seems to know what he is talking about, 10 speed crank and chain rings work just fine with an 11 speed cassette and RD.
Technical FAQ: 10- and 11-speed drivetrain component compatibility - VeloNews.com
My 11 speed road bike came with 10/11 speed FSA chain rings, which I replaced with Shimano 105 10 speed chain rings; front shifting improved slightly.