New update released yesterday revealed a backpack system (50 slots, you can empty it by deleting unlockables), which will use the future "random weapon pickup" feature. Another change to the class loadout was the addition of a head/hat unlockable and a briefcase unlockable. A look into the code revealed an Afro for demoniggs, russian hat for heavy, tooth belt for sniper, baseball cap I think) for scout and some kaiser helmet for the medic. Also, deleted unlocks can never be re-earned.