The types of rewards available on the Diablo 4 Season Pass break down like this:

  • Free: Season Boosts: These will include things like XP buffs and other things that will help make gameplay a little easier. Rewards like this are free to all players who are pursuing the Season, and you earn them as you play the game which unlocks higher tiers. While you can spend money to unlock tiers faster — for example, maybe you really want a cosmetic item at a high level of the premium tier — this won’t earn you any kind of gameplay boosts, which you’ll have earn by playing to advance through the tier.
  • Premium: Cosmetic Rewards: Expect special transmog looks themed around your class and/or the Season itself. But don’t feel like you have to pay for good looks: there are hundreds of transmog appearances you can get through loot drops or other gameplay — but the Season Pass looks will likely be exclusive to that Season. There’s also an in-game store that will sell cosmetics for a premium currency. In short, you don’t have to buy the Premium Season Pass to look good, but if you like that Season’s cosmetic items, you may want to.
  • Premium: Currency: Diablo 4 will include a premium currency that’s used to buy cosmetic items in the in-game shop. You’ll be able to earn this currency in the Premium Season Pass, and likely buy it with cash as well.

Info un pò vecchia quindi non so se hanno annuncio cambiamenti... ma google fa veramente pena orami per le ricerche: