Checking back at Amazon etc. more detail has been added regarding the release.
There's 4 minutes of bonus footage (sounds like it's just a slideshow of artwork like was included on the original Kiddy Grade PV) with audio commentary by Keiji Gotoh.
The first press release also includes a slipcover illustrated by Megumi Kadonosono and an 82-page conte booklet.
According to Neowing/CDJapan the video is 16:9 and the audio is Dolby 5.1