I commend to you this article -starting page 40 or thereabouts.
It gives a fairly comprehensive historical background around the trials and tribulations that have been the 'Caribou replacement program'
http://www.adbr.com.au/download/2010/Vol29Nos06-07.pdf
Personally I wonder how good a deal ADF can wangle from the vendor given that the C27J is already known to be the prime choice. Plus the projected savings to be had from plugging into the US supply chain may not be as great given their buy of the C27J wasn't as large as anticipated.
The ability to handle 463L pallets is also now offered by the C-295M I believe.
Is C27J still the way to go?
And here for an update on Air 7000 (global hawk stuff) page 36
http://www.adbr.com.au/download/2010/Vol30No01.pdf
cheers
rb