Crystal cleansing event

Kabam said that after the crystal cleansing event, they are going to auto pop crystals in everyone's account. Has anyone heard or know which crystals they are referring to?
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OLD Featured Champ crystals from year+ back, etc.
Ones that you can no longer get in game, and haven’t been in game for a while.
Not any that are still being earned, even though you might have 10,000 of them saved up.
Maybe there are some crystals from inactive players...