LG would release an upgrade to G6, it would be called G6+. "The G6 Plus comes with a quad DAC, wireless charging, and more storage."
If I was one of the fan an LG and an early adopter of G6 I would be pissed.
I remember this happening to oppo f1s and f1s upgrade. For just 1k more and if you only waited a couple of months from launch, you could have get a 4gb RAM instead of 3GB, and a 64GB storage instead of 32GB. I remember reading oppo's forum and many users aren't happy about it.