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so what is it and what purpose does it serve? Genuinely curious

Glint is a reward earned from battles and end of season. So instead of getting random chests you now use glint in their custom shop to get things like cards, titles and potions. Will most likely be more stuff. The thing is they can control the inflation a lot better this way and also offer up many other options for use those glint points earned. It simply replaces reward chests with a more controlled system with more reward options.

so it's just in-game currency. got it. that's actually a lot better than adding another token like i assumed. thanks for the info!