Collection DX’s Veef did a panel on the origins of some of Macrosses most notable Valkyries at Anime Boston last weekend. His writeup of the convention can be found here.
The presentation was a revised version of the one from last year and included notable new additions regarding the YF-29 and VF-30.
A full video of the panel is available on Youtube, although it unfortunately includes no information at all on the VF-2SS 😉