Although Android O is already on the way, Google still diligently provides updates for some of its Android phones. Specifically, some of the Pixel and Nexus devices are getting the Android 7.1.2 update and the April Security patch.
Xda-developers shows the complete list of Google devices that are now compatible with the updates. There are two separate patches available for the eligible devices. There is the Android 7.1.1 with April Security Patch and there is also the Android 7.1.2 patch.
The mentioned devices include the Pixel XL, Pixel, Pixel C, Nexus 6P, Nexus 5X, Nexus 6, Nexus Player and Nexus 9 LTE. Do note however that there are units that are only compatible with one patch. For instance, the Pixel C only has the Android 7.1.2 available for it. The Nexus 6, Nexus Player and Nexus 9 LTE on the other hand only have the Android 7.1.1 with April Security Patch available for them.
Changelogs are usually not provided alongside the monthly updates, but Google was able to post a changelog for the Pixel series this time around. Via Reddit, a Google Community Manager posted that the Pixel Series April 2017 Change-log include improved fingerprint swipe performance and Bluetooth improvements. A fix to the early shutdown issue has also been added alongside battery usage alerts. Moreover, there is also a fix for the pink banding issue that a small fraction of users has experienced with their cameras. Additionally, the issue regarding the audio popping that users experience while playing audio at high volumes was also fixed in the update.
It was said that these Android updates will be made gradually available to users via OTA. However, for those who cannot wait, manually flashing the OTA or factory image is also an option. The downloads are available via their specific Google developer pages, just remember to download the right build for the right device.