Clarification Update: Wolfenstein's official social page has released statement clarifying that microtransactions are in fact cosmetic only:

You can not purchase weapon or ability upgrades with real money in Wolfenstein: Youngblood. As you play, you will collect in-game currency called Silver to upgrade your equipment. Silver cannot be purchased with Gold Bars.

Original Story (June 13 at 1:20 PM Central): We recently had the chance to go hands-on with MachineGames' upcoming Wolfenstein title, Youngblood. During our session, we learned that the game would have microtransactions, with the player able to buy cosmetics as well as weapon upgrades and attachments with real world money if they choose.

MachineGames was explicit in saying that you could get these items with in-game currency and that spending real world money would just speed up the process to acquiring them. The closest comparison one may draw is to Ubisoft's progress enhancers microtransactions in Assassin's Creed Odyssey and Far Cry 5.

You can read our full impressions of our time with Youngblood here.