I think Ketron would need to market the Audya more aggressively if and when OS 4 is released.

They would need to highlight the additional improvements OS 4 has from OS 3.

As we all know when a company gives information about a product before it is released, the specs are subject to changed. So no user or skeptic should be surprised if a certain feature did not make it on the first release.

I suspect that OS 4 would be the last release for a while and then the next release of an OS would require some hardware changes.
Only time and Ketron will tell.