Apparently, its official. The Goat is dead. It may be the wrong brand but I still hate to see it die. 400 hp is a wonderful thing.
http://www.gmplanet.com/pontiac/pontiac_gto_discontinued_1_000604.asp
The following link has an article regarding the move of the Mustang assembly line from Dearborn to Flat Rock. There are some interesting comments regarding the assembly of the prototypes.
http://media.ford.com/article_display.cfm?article_id=17836
:)