Earlier the OTA update in Taiwan was released this month adding a new feature to the pressure sensitive buttons.
The security patch released in the US territory is similar to the on that was launched in Taiwan. Its a 437MB with build no 1.21.617.3. The changelog is similar to the Taiwan update. The important fox that came with this patch is the update for the pressure sensitive edge sense buttons. With this update the buttons should perform better and as expected to do so.
The update also brings a new camera feature known as Auto Zoom for video recording. But it does not anything as the name suggests rather it’s functionality is a manual zoom and just behaves differently from the SonoicZoom option. The update has also made the handset to record unlimited 4K@30fps video.
The usual battery and system performance improvements are also the part of the update and the security patch also updated to June 2018.