@treklej
Yes, the OS4 folks (Hyperion) have an exclusive license to use OS 3.1 and have done so.
If you are interested there are also two unofficial Amiga-like OSs
Morphos, originally scheduled to be OS 4, is available to run on old PPC Mac Minis and soon G4 Power Macs, they had access to 3.1 source but may or may not have license to it currently
MorphosAROS, a rewrite of AmigaOS into open source, they had no access to source (of course). Runs on several platforms including industry standard Intel/AMD boxes.
AROSICAROS