If you're with Rogers like I am, don't hold your breath or you'll pass out! Rogers just released MM for the S6 I think last week? TELUS released it awhile ago. I've seen this pattern with Rogers where they would release a software update and later pull it. I believe it was the July security update. Rogers had plenty of time to test out the software before releasing it. Meanwhile TELUS and Bell already released theirs. So I've learned from Rogers to not do the update immediately until I know it's safe.
I don't know when Samsung Pay and Android N will be released to the Big 3. But I'm going to assume TELUS and Bell will release them first. I could be wrong.