When the expansion launches, each character of level 60 or above will receive a relic chest to get you started in the new system with a choice of three core relics (exact number subject to change). Additional core relics will not be account bound and can be crafted and shared between players

I appreciate they listened and are now giving one box per char instead of one per account.

As for legendaries, I'll wait for the full list of requirements and what kind of progress is unlocked before we can say it's "significant", tho their solution looks reasonable to me.