Just wanted to weigh in here: I just got a 2016 rMBP – Escape Edition, and the D, F, G, and H keys all had the OP's popping sound. Within a few hours of heat-cycling with the lappy, only the G and H keys remained effected.
I took it back to BestBuy for an exchange (it's amazing otherwise!), and told them that this was a known issue. I remarked that Apple may have ironed out the issue with newer-manufactured batches, and that BestBuy may want to look for newer inventory for the exchange. The service rep searched through her stock, and said they had received new items within the previous month. She swapped outlay defective unit with, presumably, a newly-stocked item, and it was, and continues to be, flawless (this keyboard is something else! I agree it's louder than my mid-2014 rMBP, but I don't feel it's intrusive, and I like the feel of the keys, and the shorter travel).
Hope this helps anyone out there!
I took it back to BestBuy for an exchange (it's amazing otherwise!), and told them that this was a known issue. I remarked that Apple may have ironed out the issue with newer-manufactured batches, and that BestBuy may want to look for newer inventory for the exchange. The service rep searched through her stock, and said they had received new items within the previous month. She swapped outlay defective unit with, presumably, a newly-stocked item, and it was, and continues to be, flawless (this keyboard is something else! I agree it's louder than my mid-2014 rMBP, but I don't feel it's intrusive, and I like the feel of the keys, and the shorter travel).
Hope this helps anyone out there!