If I was to make a guess as the 'netbook OEM' Hyperion will be using, I would guess it would be LinkBook. They are the only netbook OEM I know of that use a PowerPC processor as their base.
http://www.linkbook.co.za/
http://liliputing.com/2010/05/linkbook-9-inch-netbook-with-a-powerpc-processor.html
Considering their web site is promoting the fact that their 9" is 'almost sold out', I would not be surprised if a 12" model is waiting in the wings for the 9"s to be sold off.
That coincides nicely with Hyperion's "next few months" release of the netbook, and why they didn't have a demo model at the show.
I think most other people think that the OS4 Netbook will be a LimeBook, not the LinkBook that you linked to.
Is the LinkBook based on the e300 PPC CPU? I could not find that info in any of the pages on their site. Also, I think the specs of the LimeBook match what was released about the OS4 Netbook closer than the specs of the Linkbook. It was also stated that the OS4 Netbook has already existed for a while, maybe 2 years, and that the delay in releasing it is only to get the OS4 specific drivers for all of it's components written.
I also visited the LimePC site and could not find recent pages about the e300 based LimeBook, so I guess it is a discontinued product, of which I am not sure how many were sold in the past. I am guessing that they may have a large amount of previously manufactured stock on hand that did not sell that they could repackage with AmigaOne stickers on them at a low price. Something that should have been done a couple of years ago, but better late than never.
Back ON TOPIC: I ordered my X1000 yesterday and can't wait for it to be delivered in a few weeks, or months.