Google recommends that the first thing developers do is to check to make sure their apps work, which can be done by installing the new build and downloading the app from the Play Store.
However, it should be noted that major releases like this one are often subject to date changes.
Google launched the first Android O developer preview in March and the second developer preview in May at its I/O 2017 developer conference. These include the Pixel, Pixel XL, Pixel C, Nexus 5X, Nexus 6P, and Nexus Player. The new update will surely shake the entire Android market and for the very same reason, Google's Pixel series will be high on demand. In fact, some new posts on the forums have already appeared regarding the update. The Android O Developer Preview 3 has been labeled OPP3.170518.006. However, the platform is dominated by Android 6.0 Marshmallow and Android 5.0 Lollipop, accounting for 31.2 percent and 30.8 percent of the overall distribution. And then it will release Android 0 to consumers "later this summer". Also check out adaptive icons, XML font resources, downloadable fonts and emoji, autosizing TextView, AAudio API, and many others. Google mentions that system and app performance is known to be periodically slow and janky with the device often becoming unresponsive. This will have the same effect of flashing the corresponding factory images, but you will not need to wipe your device. This app takes the liberty to find and stop harmful app fro your device.
In case your device isn't one in the list of devices getting the update in August, hold back, you may get it soon. The company notes that the two patches concentrated towards security offer "Android partners with the flexibility to more quickly fix a subset of vulnerabilities that are similar across all Android devices".