Nexus 9 Android 5.1.1 Release
The Nexus 9 never got Android 5.1 Lollipop. Instead, it toiled on Android 5.0.2 and below until this week when Google finally decided to roll out Android 5.1.1.
Google's Nexus 9 Android 5.1.1 update is rolling out to the Wi-Fi only model and the roll out should finish up in a week or so unless Google spots major problems. We haven't seen or heard about any so it appears to be in good shape.
It's not clear when the Nexus 9 LTE will get Android 5.1.1 but we'd expect the roll out to happen in the future. We can't see Google awarding some Nexus 9 users with a new version while leaving other Nexus 9 users behind on an older version of Android.