As for the fishing for OEMs part: No they do not try to convince anyone to buy AmigaOnes.
They are looking for people that have their own board or are developing one and need an OS for it. Hyperion will be very happy to adapt OS4 to any Hardware an OEM with have under it's arm.
Due to some stupid licensing problems the OS will not be called AmigaOS 4 on that targethardware anymore. More likely it will be called "The damn Software that powers our machine" OS, but that doesn't matter as it will still be the same OS.
Developments made for some OEMs might even find its way back to the "publik" AmigaOS4