I don't know if this has been talked about but there's more info about the three Mamoru Hosoda films CEs.
The Girl who leapt through Time
**The Collector s Edition includes deluxe packaging with a gorgeous premium clear sleeve, plus an exclusive 52 page book full of behind-the-scenes content about the film, including making-of spotlights, interviews, a message from Director Mamoru Hosoda, and artwork**
Special Features:
Premiere Screening Event Direction File (A Talk With the Director)
Behind the Scenes at Premiere Screening Event
Hanako Oku 'Garnet'; Music Video
Theatrical Trailer
Promo Clip
Feature Commentary
Feature with Storyboard
Feature with Storyboard Commentary
U.S. Trailer
Trailers
Summer Wars
**The Collector's Edition includes a special deluxe clear sleeve and a 52-page companion book**
Special Features:
Interview with Mamoru Hosoda (Director)
Interview with Ryunosuke Kamiki (Kenji Koiso)
Interview with Nanami Sakuraba (Natsuki Shinohara)
Interview with Mitsuki Tanimura (Kazuma Ikezawa)
Interview with Ayumu Saito (Wabisuke Jinnouchi)
Interview with Sumiko Fuji (Sakae Jinnouchi)
Teaser Trailers (2 trailers)
Teaser TV Spot
Original Trailer
TV Spots (7 spots)
Ame & Yuki Wolf Children
**The Collector's Edition features a handsome clear sleeve and a 52 page artbook of interviews and concept art**
Special Features:
U.S. Actor & Staff Commentary
Stage Greetings
PR video Director's Versions 01 & 02
Promotional Video
Original Trailer
Original Teaser
U.S. Trailer
Trailers
Basically the same stuff that the Funimaion CEs have.