Dying Light 2 Stay Human

Microtransactions in Dying Light 2 Stay Human are summarized as...

At launch the games has 2 "premium" editions. The first grants mostly cosmetic content but will also grant access to one of the upcoming DLC. The second grants access to 2 upcoming DLC but will also provide in-game bonuses in the form of bonus XP earned.

At this point the game does not feature microtransactions of any kind.

Contains one or multiple Season Passes, encouraging the purchase of unknown DLC you might never have purchased otherwise.
Has a "deluxe" edition of the game which features (almost) nothing but in-game cosmetic items.
Features unique cosmetic rewards for pre-ordering the game.