There is about half a year still left in between now and the release date of the next Pixel flagship smartphones, but that has not managed to put a lid on the rumor jar though! Even before we actually get to the Pixel 4 and Pixel 4 XL, let us inform you that Google may likely release cheaper versions of the Pixel 3 and the Pixel 3 XL much sooner. They will both be the "Lite" versions of their costlier siblings, but we are not sure about what Google will sacrifice on those two comparatively budget smartphones, if and when they come out.
As far as the Pixel 4 and Pixel 4 XL are concerned though, a few things are almost for certain and one of them is the fact that both the new phones might be launched in October, 2019. If there is another piece of reliable info that can be depended on, then it would be that both the flagship handsets will be sporting Android Q, aka Android OS 10. Not much is known about the Android Q OS yet though, except vague information regarding a comprehensive dark mode, better security and reliable facial recognition support.