That’s right. p&p is working on the v2.0 of the Application Architecture Guide. J.D Meier just announced the availability of Beta 1 of this guide. Check it out here. http://www.codeplex.com/AppArchGuide
If you are at PDC, stop by the p&p pavilion to get this cool App Arch poster. It looks like a sticky note and it sticks like a sticky note except it is 30 X 30 inches in size.