Why revealing prestige kai'sa only now ???

I wanna try and get it, obviously bought the world pass at the start of the event. But I thought the rewards at the time were the only rewards that could come for the world tokens. Now I'm here, already spent like 900 tokens in orbs, getting shit like usual (not gonna complain tho, it's cool we get some free stuff). But if I knew about the prestige skin, I surely would have save a looot of tokens to try and get it. Now, with 900 of them already consumed, feels like I can't have it anymore. Why not telling us before for this skin Rito ?
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