FYI, just received a OTA security update on my G930U, dated March 1, 2017.
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This is G930UUES4AQC1 (4AQC1). It appears to be just a security update, still Marshmallow. Update took 15 minutes after downloading.
Android version: 6.0.1
Android security patch level: March 1, 2017
New firmware was approved for installation. It only brings June 2018 security updates.
June security update got today.
Today I received a new firmware. It only brings Adroid security patches from July 2018.
October update is out.https://developers.google.com/android/images#sailfish