I just had the keyboard (really the entire top assembly) replaced on my 13" 2016 mbp, and I'm pretty sure it got the 4th gen keyboard. The keys feel and sound significantly different, and the Apple employee who did the replacement (or I think that's who I talked to) said that they were putting redesigned keyboards in for the replacements. I was pretty unhappy that I had to get this done and I'm still not in love with the machine, but I will say that with less than 24-hour turnaround and the new key feel, the replacement process left me with a good impression.