So it'll be yet anothe attempt of OOP people to design an operating system
So far the results were fairly mixed. Windows, probably the most famous system based on OOP principles, has changed so often into so many directions, you can hardly see the original idea of objects (Windows and GUI elements) passing around messages (events).
BeOS seems to have been rather decent, but thanks to it being closed source and rather incompatible, it didn't actually have a chance.
My guess, and I actually hope that people will proof me wrong, is that it'll be just a mess like Android. A system far to complex to be maintained without the help of Google. A system that offers so little useful functionality under a coat of shiny stuff. A system that sees locking out the user as a security feature. Much of this won't be because of the system design itself, but because of the people such a design will attract.
However there is one really good thing that could come out of this. It could attract the systemd/freedesktop people away from Linux.