From what they've shared so far, it seems to be similar to large scale errata. A lot of names changed, some functionality here and there, but not a completely different rules set. Once we have a plan for it, I'll let you all know, but in general I'd expect it to be treated like errata where we switch existing things over to the new names/text, rather than an opt-in/out for rules sets. But bear in mind that's me spitballing based on what they've shared, and once we see the full scope of changes it all is subject to change.
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