For some reason I did not receive the three most recent NIS Prinny Bomb (
newsletters) e-mails, but this got announced in Prinny Bomb #523 on April 27th.
We now have the Limited and Launch Editions both in collectible boxes with a copy of the soundtrack CD. Artbook is still exclusive to the Limited Edition, and man is that a big book and equally big artbox it all comes packed in!

NicheGamer has an entire article dedicated to the limited edition, along with additional pictures preview pictures of what it looks like.:
http://nichegamer.com/2015/02/sneak-...-tokyo-legacy/