I don't know. The deal is between Hyperion and Stefan Stuntzi. Personally I don't find it wrong call it MUI 4 even if it is not "our" MUI 4.
In the end it makes sense. Odyssey is using number of new MUI classes and to port Odyssey to other platforms it is easier if they are available rather than add workarounds to Odyssey core. It can also mean that finally those N* classes could be dropped and multiplatform programs like Yam could finally use new APIs.