If you're curious about what's new in the Android 14 QPR1 beta but you don't want to run unstable software, I made a roundup of every new feature and change I spotted in Beta 1: https://www.androidcentral.com/apps-software/android-14-qpr1-beta-1-every-new-feature

By the way, I heard that the Google Pay issue was resolved in the last 24 hours, so you should be able to make contactless payments now if you're on Android 14 QPR1 Beta 1.