There was a Unifi event in South American where a presentation included a version of the new Unifi Cloud Gateway Ultra with a M2 SSD for Protect. See Reddit - Dive into anything and see Cody’s video https://www.youtube.com/watch?v=dZb3r7cHj9Y.
That link above leads to a few other links. I am hoping this comes true. I for one would welcome the upgrade to replace the very old CloudKey Plus Gen2. Granted there is a the Unifi NVR Pro and UVR, but not everyone has space for a rack.