Google just posted the Android security update for May, 2017 and the files are already live for a number of devices.
Listed on Google’s website, we are seeing files for the Pixel and Pixel XL (N2G47O), Pixel C (N2G47O), Nexus 6P (N2G47O), Nexus 5X (N2G47O), Nexus Player (N2G47R), Nexus 9 LTE (N4F27B), and Nexus 9 WiFi (N4F27B).
Specific Verizon builds for the Pixel and Pixel XL are also available, labeled both as NHG47L.
You can grab each image or OTA file at the links below. For instructions on how to flash a factory image, here you go. For instructions on how to flash an OTA .zip file, here you go.
As more files arrive, we’ll update this post.
Links: Factory Images | OTA Files | Security Bulletin