Google's December update for its Pixel family of smartphone is now rolling out to the Pixel 3, 3 XL, 3a, 3a XL, Pixel 2, and 2 XL. In the support thread containing the changelogs, it's mentioned that the Google Pixel 4 and 4 XL will begin receiving the December update next week. The excerpt at the end of the following quote mentions improvements to face unlock, so we might expect to see the Pixel 4 and 4 XL face unlock updated with improved security. In addition to the specific items listed above, the December update includes hundreds of various fixes and improvements across many areas...
Source: https://www.gsmarena.com/december_security_update_now_rolling_out_to_google_pixel_devices_face_unlock_fix_incoming-news-40375.php
