So lets get realistic: No show at Cebit means no show this year.
And more realism: How on earth did anyone expect OS4 to be more than hot air? Look this way: What you need to develop an OS is _manpower_ , many many hours of it. It doesn't matter how elegant the design or anything, there's just no way around the fact that you need to throw massive manpower at the task to develop and entertain a modern OS. Now it's safe to say that A-OS4 to this day recieved about 0.000001% (or less) of the manhours that went into Linux, for example. Did you really believe a handful of developers working in a shed in Germany could rival any of the available OSes?
Btw. the future is named GNU/Hurd