In less than three weeks after releasing Android 5.0.1 update for its devices, Google has released factory images for Android 5.0.2 and also pushed the same to AOSP for the Nexus 7 (2012) WiFi. This tablet did not receive Android 5.0.1 update, so it got directly updated to 5.0.2 (LRX22G).
According to the official changelog, the Android 5.0.2 update fixes storage issues and alarm problems. Google usually releases bug fix updates for the Nexus devices upon hearing the comments from the users. This time it has released several minor updates in few weeks after the original Android 5.0 update even after it was reportedly delayed for few days due to some bugs.
You can download factory images for the Nexus 7 (2012) Wi-Fi from the Google Developers website here. No sign of OTA update as of now. It is not clear when other devices would get the update.