It's good news for Hyperion, I s'pose but what have they won?
I'm in the same boat as bhoggett and wayne here, even with this news it's hard for me to be enthusiastic about AmigaOS in 2009-10 apart from some residual sense of nostalgic fondness or familiarity for the name and the GUI conventions.
A platform is only as useful as its applications and modern AOS can't begin to attract the quality of software development that the average computer user has become accustomed to over the last 10-15 years using Windows, MacOS and even Linux.
AOS has a niche as a hobby platform among Amiga enthusiasts, but that doesn't seem to be a sustainable market for a business such as Hyperion to thrive in, long term. So eventually they will have to concede, taking future OS development with them.
Of all the Amiga-ish flavours I would guess AROS might eke out some future being open and hardware agnostic, but even that will have trouble being anything more than a novelty/hobby platform.