I was getting prepared for my MKII to show up on Thursday (tomorrow) so I decided to install AVR Studio to update it when it arrives. I normally use Linux, so I had never installed it... when digging around in the documentation I found this about the MKII:
* Hardware revision 0 does NOT support the PDI or aWire interface, and have serial numbers starting with A0... as shown here.
* Hardware revision 1 supports both PDI and aWire. Serial numbers start with A09-0041 or B0... as shown here.
* Revision 1 units are also fully RoHS compliant.
PDI was one of the main reasons I purchased this item, so it looks like I am hosed. I should have bought the clone :(
If you are looking to purchase this for PDI be careful.