Ryan Ding of Huawei is waiting for updated Broadcom firmware, which he expects before the end of the year. He will then be able to supply units for telco trials "in the first half of 2018."
Ding and everyone else are working diligently to get the DSLAMs ready to deploy in volume as soon as possible, I think late 2018 looks most likely. We won't know for sure until we have several months of tests.
Preliminary reports are that both the Sckipio and Broadcom chips are reaching 1.5 gig.
That makes sense as the spectrum used more than doubles. AT&T is seeing about 750 MHz with the 106 MHz chips The "gigabit" of the original G.fast announcement might be possible in lab tests, but it better to think of first generation speeds as 500-800.
That's important to AT&T. CEO Randall Stephenson told Goldman Sachs, "We must have a gigabit." Comcast is on track to offer reliable gigabit cable to 40% of the U.S. by the end of next year. Today's cable standard, DOCSIS 3.1, is designed for a gigabit downstream. The upgrade is cheap enough that almost all cablecos will do it.
AT&T also wants the reverse power feature, which I understand is improved in the new chips. AT&T's first market is large buildings, where they can easily get a power connection. But they intend to go to smaller buildings from "distribution points" without power.
Salesmen are making many promises, but I'm skeptical until I have results from the field.