The Memoji feature is currently limited in terms of which Emoji-inspired emotions translate to the personalized characters. Once the new update launches, however, users will be able to choose between nine new emotions.
The new Memoji stickers coming with the iOS 13.4 launch will include Screaming in Fear, Party Horn, Rolling Ryes, Face with Steam, Folded Hands, Gesturing No, Person with Tipping Hand, Smiling Face with Three Hearts and Person Behind a Computer.
Non-developers are currently able to sign up for iOS 13.4 beta testing over on Apple’s beta testing website. However, do keep in mind that it is not recommended to run beta tests on your primary devices.