Rune Enthusiast Ward Skin?

If someone is available, how do you get this ward skin? I know it was on the PBE, and I saw someone use it in game. I was under the impression that it'd be given out to everyone who used wards in the past, but I could be mistaken. Is there some other way you're supposed to get it, or is it a "We're sending them out, it might take some time" sort of thing?
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