More details here, this article from xda states there will be a Public Beta but no Date given yet. Pre Beta test for Developers not yet available in Europe. https://www.xda-developers.com/samsung-galaxy-s20-one-ui-3-android-11-developer-beta
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .