We think that Google will release Android 5.1.1 to the Nexus 7 (2013) and the Nexus 9 in the coming days. We assume this because Google has recently referred to it in an “Audio Latency Measurement” page on the official Android source portal. In the image below you can see the chart from the page. As you can see it says that the Nexus 7 (2013) and Nexus 9 are running Android 5.1.1. We don’t have any idea as of now what new features the update may bring but we assume it will be quite minor, maybe just a few bug fixes.