http://www.gm-trucks.com/forums/topic/164349-201415-hd-powerfold-oem-tow-mirrors-the-ones-weve-been-waiting-for/
Take a look at this thread for more information, Supercharged SS is the vendor that was able to get these mirrors. If you have power folding mirrors now then these are plug and play. The power folding, turn signal, power mirror, programmable mirror, etc. will all work. They have amber clearance lights and white LED's which are new to GM and these lights have to be wired to work at this time. There are folks looking into programming the truck to have them work as well. At this time GM has not offered a reflash to make these lights work on 14's. The mirrors are an option on 2015's. I did the install myself and can provide more info or pics if you decide to do it.