OnePlus is rolling out OxygenOS 4.1 based on Android 7.1.1 on its flagship devices 3 and 3T. There only few Android phones with Android 7.1.1 Nougat. The update is also packed with March Android Security Patch and includes some other improvements.
Android 7.1.1 includes new emojis to the device, Google’s ‘gender-equal’ emojis are coming. After the update you will also be able to send gifs directly from your keyboard on supported apps, while Google’s Daydream platform also got further optimizations through this update.
Full Changelog
The OTA is incremental, as usual, so you will just have to wait for now. As of this writing, the downloads page has not been updated with OxygenOS 4.1, but that could change soon.