I contacted Dave Mathewson to find out if he has any additional information. I have a feeling that the AMA is going to keep this close to the vest and there won't be a lot of info coming from them.
I wonder if this was initiated over the Prado incident?
I was just on the FAA's website and nothing's been posted yet.
http://www.faa.gov/avr/arm/nprm.cfm?nav=nprm
BRG,
Jon