The latest Android 12 beta has revealed more details about the Pixel 6 and Pixel 6 Pro. According to several sources, Android 12 Beta 4 contains references to the Samsung ISOCELL GN1 and the Exynos Modem 5123, which are both destined for the Pixel 6 series.
https://www.notebookcheck.net/Google-Pixel-6-and-Pixel-6-Pro-camera-and-modem-hardware-revealed-by-Android-12-Beta-4.554868.0.html
All these leaks can't decide on the hardware.
Many leaksters mentioned it to be Sony IMX sensor, some said it is new custom made Sony sensor, other said it is really a new 50MP sensor from Sony which is made for Pixel 6 line and upcoming Sony Xperia flagship phone.
Of course a lot of predicted it to be GN2 because of what was available and more obvious choice.
Honestly I myself prefer and expected it to be Sony IMX, specially rumored new 1/1.18" size or even 1/1.28" size 50MP sensor, plus sensor capable of 4K 120FPS.
And now bam, it is Isocell GN1 sensors, year and a half old sensor.