Maybe but most likely not. Since Apple seems to loathe using 3rd party USB chips, you'll have to wait for Kaby lake which has USB 3.1 natively built into the chipset. That looks like a 2016 Fall refresh at the earliest. I'm going to shoulder my 2012 iMac just a bit longer as I want a proper 16nm GPU that at least is >50% faster than my 680MX, not a hot running 28nm tech we've been using since 2012.