I'll believe it when I see it. These days, words are basically meaningless from these large tech companies. Actions are what matter.
at the very least, I'm not convinced this internal branch and AOSP will be close to feature parity if they do throw some stuff out.
Kindle Fire is based on AOSP, that was my mistake. I will say Amazon is a rare OEM in this regard; they're tablet-only, and happy with AOSP because they have their own app store that don't need Play Services integration.
For instance some parking meters / train ticketing machines / payment terminals run Android. source: I work for company that makes some of them though we are moving away from Android to more classical embedded Linux.
Google play services doesn't matter in these contexts.