For those wondering what is in this limited edition, here is what is written at the back of the DVD case.
Special: Behind the Scenes, Deleted Scenes, Photo Gallery
Features: Poster Gallery, THEATRICAL ENGLISH SUBTITLES (anglais seulement)
The front of the case has: Limited Edition, Let The Right One In, (Version Francaise)
I have not opened or viewed the DVD yet, but I think the most important thing is the fact that this edition has the correct THEATRICAL ENGLISH SUBTITLES.