This portion of the blue post explains them:
It’s Over 100!
Players who collect 100 Tokens over the course of the event will unlock the ability to earn additional Tokens from 20th Anniversary activities.
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Revamped Tier 2 Discount Prices Announced – WoW 20th Anniversary Event
With today's blue post on the upcoming WoW 20th Anniversary purchases, we have finally learned the discounted prices of all revamped Tier 2 appearances! You will need a total of 320 Bronze Celebration Tokens to obtain all 13 Eternal Tier 2 sets.
