Blizzard stated somewhere, that we will have to do some achievement in the next xpac, in order to be able to unlock the Artifact Skins, I hope it will just be "hand over x amount of gold" to get the skins, like we did with the WoD CM tmogs, instead of:
To unlock the PVP skins: Reach 2k rating.
To unlock the raid skins: Get X curve achievement:
To unlock the first row: Do every dungeon in new xpac, on m+ X
To unlock challenge skins: Do X new challenges
etc etc etc.
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When the new xpac goes live, we can upgrade 1 loom weapon to 110-120