In its demonstrations of how predictive back gesture works, Google used an updated design of the arrow, which had its own container. And the first beta version of 13 QPR2 lets us see it “live”.
The new design is being tested separately from the predictive back gesture, but for sure they will work in conjunction. Unfortunately, it will not be possible to activate it by simple means. So we just have to wait.
Read More on Android 13 QPR2 Beta 1: