redrumola,
OS5 is a total hoax. Of course AInc. could come out with some product and arbitrarily label it as "OS5" simply to fullfill the prophecy, but as far as the OS as stated by McBill - hogwash.
I'm not even sure AInc. even understands what an OS is. It seems like they originally were trying to sell AmigaDE as an OS in itself, when in reality it's just an API running on a VM. It wouldn't surprise me if they came up with a Linux library and claimed it was an "OS".
Besides, I'm not clear on what it is OS5 as stated by McBill does that Inferno doesn't do already.
http://en.wikipedia.org/wiki/Inferno_(operating_system)
