Don't know about official UK release but i've been running a WaveEngine in the UK for almost a year, app and all connectivity work perfectly fine, the power supply just needed a kettle lead from Amazon. I've tried a lot of kit and can honestly say nothing comes close to a WaveEngine + four Reef Octopus Octopulse 4 pumps. If covid hadn't halted travel, I would have brought back a Hydros controller by now! Obviously this will need some more UK specific tweaking if you're looking to use the powerbar.
They don't give out information usually before they release things. but the power pack that comes with the controller is 100-240v 50-60hz so it should work with an adapter plug. The power strips are tuya protocol so I am guessing you can find a UK version of the same wifi strip CoralVue uses. Here is a video link on youtube with Carlos and Dave. It mentions Europe when they were talking about the XP8. That starts about 28 minutes in . It doesn't sound like they have forgotten about Europe from the discussion. They did miss their projection on the the release date for the XP8 though.