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Limbus is not connected to Absolute Virtue or the Chains of Pormathia missions though, thankfully, so those parts should stay as they are.

It's in the latest version update notes at the time of writing, here:

Announcing the January Version Update

Indeed, and they also mentioned that "you will no longer need ancient beastcoins or items to take on Limbus", which further makes me lean towards thinking they are indeed changing the old as well.

Well, Dynamis as it was is no longer available either, and the wording in the update notes [1] is quite ambiguous. I haven't watched the stream yet where they talked about it, but my first though...