Google Pixel 4
16 MP, f/2.4, 50mm telephoto, 1/3.6, 1.0µm, PDAF, OIS, 2x optical zoom
USB Power Delivery 2.0
Yes, Google Pixel 4 offers IP68 rating, which means it can survive up to 1.5 meter (4.92 feet) for 30 minutes underwater and can endure dust and other small particles.
Google announced 3 major Android updates. So it will receive Android 11, Android 12, and last update will be Android 13.
Google announced 3 years of security updates for Google Pixel 4, so it will receive patches approximately until 2022.
No, Google Pixel 4 doesn't have Wi-Fi 6 version or newer.