Excellent! While I don't always agree with Hyperion's design decisions for OS4.x, this is great news for the platform. A major weight has been lifted.
Looks like Amiga Inc still has rights to OS3.0 and below, however, and that could come back to haunt someone in the future. Hopefully they'll just throw in the towel at this point and someone with a vested interest in the community could pick up full rights to the older stuff. Cloanto, maybe?