I prefer the old breastplate, it just keeps getting larger and larger and larger...
I have more information on the movie but it's a wall of text and all in Japanese, so here is the link if anyone wishes to translate.
http://ivory.ap.teacup.com/nagaharuhenyo2/2450.html
Obviously A's is going to have a transformation sequence. If it's anything like the series, Nanoha and Fate will have it at the same time...and thus sport their new barrier jacket