Many people were curious how Google would be handling the software side of things with the Google Pixel and Pixel XL. Before release, a system image of the Verizon variant was leaked and that was all we had to go on. So many weren't even sure if Google would allow us to root and unlock the bootloader of Google's 2 new smartphones. Just before release, we learned that if they were purchased from the Google Store then they were in fact, rootable and the bootloader could be unlocked.
This still left questions unanswered about other parts of the Android software though. Legally, Google only has to release the source code for the kernel and that's it, but it seems like they are treating the Pixel and Pixel XL more like Nexus devices than some had originally thought. The company is even keeping the Pixel and Pixel XL listed on the Nexus Files for Developers page that we are used to finding our Nexus images at.
Google Pixel users can find the download links for their factory images here, while Pixel XL owners can find their factory images here. Download links for the OTA images for the Google Pixel can be found here, and Pixel XL owners can find their OTA images here. Lastly, the driver binaries and vendor image for the Pixel can be found here, with the binaries and vendor image for the Pixel XL is right here.
Now, as far as the factory images and OTA images are concerned, there are three builds that are currently available (NDE63H, NDE63L, and NDE63P). The NDE63P build is the one that Verizon announced would be pushed to Pixel devices on launch day. This is the update that is said to include "Wi-Fi connectivity" improvements. Some are saying this latest update hasn't fixed their 2.4/5GHz switching issues though.