https://wccftech.com/download-ios-13-4-ipados-13-4-gm-today-for-iphone-and-ipad/

Apple has released for download iOS 13.4 and iPadOS 13.4 GM seed for both iPhone and iPad devices. Final version will be released next week.

Apple announced the brand new 2020 iPad Pro today, and along with that, the iOS 13.4 / iPadOS 13.4 release date, all set for March 24, next week. But today, Apple is releasing the GM seed of iOS 13.4 and iPadOS 13.4 for download. This is meant for developers only and is essentially the final build of the software which will be seeded to everyone next week.