The workability of the extensions depends on the kind of extensions you’re using and whether they depend on the LUMA JS libraries. As soon as you buy Hyva license, you get immediate access to the public compatibility extension library. The library has pool extensions for your store. As far as the recent news goes, most extension makers and providers are considering Hyva as a game-changing frontend for Magento 2 and are looking to build compatible extensions for the theme. So if you don’t see any theme supported now, wait for a while. The good part is Aureate Labs make extensions compatible for your store. So you don’t have to wait for the extension providers to have compatible versions.