It certainly is "updated" firmware in that it's build 674 rather than the build 538 that the older Gen3's shipped with, and it appears to have all the new features that the newer firmware has, such as event buffering. I suspect that the new firmware was written for the new hardware, and that the differences between 674 and the 685 "update package" are just minor tweaks of various sorts. I've noticed no differences at all in functionality between the two versions.
Did your update work OK?
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