Hi Magne,
Welcome to Microsoft Community.
At this time, Microsoft has not announced any plans to release a new version of the Surface Studio.
Regarding your current Surface Studio, it does not support using it as an external monitor through traditional wired connections like HDMI or DisplayPort. However, you can utilize the "Projecting to this PC" feature in Windows 10 and Windows 11 to wirelessly project the display from another device to your Surface Studio. Keep in mind that this method may introduce some latency and is not suitable for tasks requiring real-time responsiveness. Screen mirroring and projecting to your PC or wireless display - Microsoft Support Your SincerelyHahn. W - MSFT | Microsoft Community Support Specialist