FoleoOS and PalmOS on Linux: how different are they?

There's an excellent thread going on over at Brighthand, talking about Wind River System's involvement in Palm's FoleoOS. Obviously Palm outsourced a lot of work, but that about the next-gen PalmOS on Linux a.k.a. PalmOS 7 they are working on to power their future Treo's?

I made have this posting in the thread:

Colligan and Hawkins have always felt very strongly about Palm developing its own OS in-house, so it can control the destiny. While bringing Colligan and Hawkins back into Palm when merging Handspring into Palmone, I'm not quite sure whether they were happy that Palmone lost control over the OS, as that was more Nagel/Benhamou/Bradley's idea. And we all know Benhamou and 3Com's involvement was the primary reason anyway for Colligan and Hawkins to leave Palm, the company they'd created in the first place, at the end of the '90s.

Having transformed the new Palm into a Handspring II today (Palm's only viable product line is Handspring's Treo), and having removed the last 3Com bastion (the same Benhamou) from the board of directors, Colligan and Hawkins also regained control over PalmOS before moving on to an in-house Linux OS for the next-gen Treo's.

Apparently, the OS-requirements for the Foleo and the Treo are so different, that they outsourced a lot of work for the FoleoOS to Wind River Systems, while still keeping everything in-house for the new Palm/LinuxOS for future Treo's. I really wonder how different these two pieces of technology are.

What if...?