My 2011 doesn't have an 'M' button either. I thought I recall that I had to order an option/package that would have included the 'M' button, but I can't find this information on the BMW USA website now.
I had planned several after-market mods, so I didn't order any performance options. When I want extra power, I turn my DSC off, then ratchet up the little button on the center console to S6. I don't have EDC either.....installed a TC Kline suspension instead. The only buttons I have are "Power" & "DSC"