So, call me dense but I didn't find any actual solution other than to wait for it. It's been a couple days and it hasn't updated in game or as the launcher icon. Is there any other info I could provide that might help you help me?
So I've noticed that in the past week with Hexxit and a few other modpacks that my skin won't update to the new one I uploaded on minecraft.net. I'm stuck with one that I changed from about 8 days ago I, think.