There are official files for the Unchained rules. I don't know that it's all implemented in HLC (and thus in HLO) but I can say for sure that the Unchained versions of the classes are working in HLC, as well as the Wound Threshold rules and the no alignment rules. I've also used the spells require attack roles rules, and a few others.
The Community stuff for Unchained is primarily workarounds for archetypes for Unchained classes that aren't officially allowed. Those won't be ported over to HLO unless LW figures out a way to allow custom user content.
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