They only own Amiga OS 4.x that's it. They can never make Amiga OS 5 or later as far as I understood it.
Actually Hyperion have exclusive rights to the AmigaOS name, including all subsequent versions including OS5 and beyond. The agreement with Hyperion, Ainc have effetely signed over AmigaOS for good, they can't ever licence the AmigaOS name to any third party companies like Commodore USA, and I doubt they receive any royalties from current sales of OS4.
