I got this e-mail back from Microsoft Certified Partner support on Wednesday.....

Thank you for your email in regards to the MSDN PDC DVD Set. This product is not available as yet, however I have placed an order for you for when these do become available. Please allow 2 - 4 weeks before you receive this shipment.

What can I say? Yay! I can't wait for them to arrive. My “old” Athlon 1800 XP with GeForce4 should be just the machine to load Longhorn on to.