Well......it's better they wait until OS4 is completely ready. After all, when they stand there showing the world some new Amiga stuff, they'll better be there with a product they can trust, and which is ready for shipping.
It would be stupid to miss out, on all the eventual copies sold on such a huge show. Many people would without a doubt buy AmigaOS4 instantly. Amiga Inc. would miss out on all these potential impulsive customers.
I find it a wise move to wait for another show, and then be much more prepared.
Remember that this is one of "the big" news on the computer scene. Everybody will possibly discuss whether OS4 is up to our days time. It would be extremely stupid to face the global computermagazines, websites, etc. on such a show with a "half product".
Belive me....the wolves will be mercyless when confronted with a company who's supposed to be dead, and suddenly claims they are alive, and kicking with a new product.
This shows that Amiga Inc. understands this, and shows the responsability towards the Amiga it deserves! :-)