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I don't have any info regarding their implementation plans/status.
I tried to get info from them, see the thread at https://twitter.com/TobiReif/status/842677207709433857 .
News from that thread: From Opera:
"ES6 is not supported in Extreme data savings mode. It might work when you turn extreme savings off but that [...] all depends on the level of support provided by device software Mini client relies on. So I guess the answer here is no."
This page shows red (no support) for most of features regarding Opera Mini: