> I am 99% sure it is something 5121 based from THTF/Lime.

More hints:

"First contacts for this were made at last year's AmiWest"
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=34459&forum=33&start=180#634073

And now have a look at the infamous meet.mrnrg's AmiWest 2010 report:

"PPC Notebook running E-UAE was also taken note of as a interesting concept."
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=32625&forum=16#586196

"PPC on the laptop is more than likely to be a Freescale's power-efficient MPC5121e mobile GT"
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=32625&forum=16#586265

And just for kicks some of the hilarious threads started by him, for those who didn't know them already:
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=28546&forum=2
http://amigaworld.net/modules/news/article.php?storyid=4916
...and from his website:
http://www.google.com/search?q=site:amiga.easypocketmoney.com

:-)

Edit: Also, H.-J. "Rogue" Frieden on whether he was surprised when Hyperion approached him (and his brother) about the netbook project:

"I wasn't surprised because somebody approached Hyperion about it, and I knew about it beforehand so it wasn't really a surprise for us."
http://www.amigaz.org/wp-content/uploads/audio/art/ART_20111225.mp3

[ Edited by Andreas_Wolf 21.08.2012 - 09:25 ]