I don’t seem to have the new features on my iPad Pro.
Hey! According to Apple’s iPadOS 15 preview page on their website, it says that Swift Playgrounds will be ‘Coming in a software update later this year.’ (see the asterisk on the footer of the page) Im not sure if this is with iPadOS 15 when it launches or not but I don’t think it’s available on the betas now. Hope this helps 😀