I've heard the beta is out for some phones and locations, but don't see where it is I can register. Some have said it's full, but I have never seen a spot ot register.
This is the announcement that was made:
Registration is through the Samsung Members app. There will be a banner under the Samsung Pay rewards section on the home page. Please note that only Sprint, T-Mobile and U1 (Unlocked) devices are supported. Any other carrier branded devices are NOT supported.
Complete Galaxy S10e/S10/S10+ One UI 2.0/Android 10 beta info can be found here: https://us.community.samsung.com/t5/Galaxy-S10/One-UI-2-0-Android-10-Mega-Thread/td-p/880136