Nevermind, I've got some help, S-TLK.org states this:
[quote="s-tlk.org"]05.26.2011 - Confirmation and release dates
This is an overview of the different release dates and features of the Blu-Ray Disc and the cinema release of The Lion King. In the United state the dates are the following:
On September 16, 2011 The Lion King will for the first time ever appear in 3D in theater
On October 4, 2011 the BD in high definition and 3D will be released as well as an 8-disc special collectors edition
The dates for Germany, Switzerland and Austria:
On November, 10 2011 The Lion King will for the first time ever appear in 3D in theater
And as well on November, 10 2011 the BD in high definition and the Triology containing The Lion King, Simba's Pride and The Lion King 1 1/2 will be released
Concerning the Bonus material and different boxes the following information seems to be confirmed:
For the 8 Disc edition:
Disc 1: The Lion King Blu-ray 3D Feature Film
Disc 2: The Lion King Blu-ray Feature Film + Bonus
Disc 3: The Lion King 1-1/2 Blu-ray Feature Film + Bonus
Disc 4: The Lion King 2 Blu-ray Feature Film + Bonus
Disc 5: The Lion King DVD Feature Film + Bonus
Disc 6: The Lion King 1 A533; DVD Feature Film + Bonus
Disc 7: The Lion King 2 DVD Feature Film + Bonus
Disc 8: The Lion King Digital Copy Feature Film
The Bonus material for The Lion King:
Never Before Seen Bloopers
4 Never-Before-Seen Deleted Scenes
Deleted Song
The Morning Report: Extended Scene
Disney Second Screen
Pride of The Lion King
The Lion King: A Memoir-Don Hahn
Disney Sing Along Mode
Interactive Blu-ray Galleries
Audio Commentary
Disney's Virtual Vault: Classic DVD Features Powered By BD-Live!
And for The Lion King 1 1/2:
Timon and Pumbaa's Vacation Safari
Deleted Scenes
Timon: Behind the Legend
Before the Beginning: The Making of The Lion King 1 1/2
Music Video
Timon and Pumbaa's Insectapedia
"One by One" Animated Show
Proud of Simba's Pride
Timon and Pumbaa: Find Out Why
Music Video
So far it seems to be the same, that were before on the LD, or the DVD, but perhaps there will be some new bonus material. The Memoir from Don Hahn and a few other seems promising. Don't forget to preorder it on amazon, or whereever you like, before it's to late.

Now a small overview over the different announced boxes: The Lion King 4-disc 3D Combo Pack, containing the TLK BD, a 3D BD, the DVD and a digital copy. Also there will be a 2-disc BD and DVD Combo Pack available and finally the one disc DVD set. And of course the 8-disc collector edition already discussed above.
Now some technical specs: The Lion king will appear on BD with a resolution of 1080p and aspect ratio of 1.78:1. Simba's Pride and TLK 1 1/2 will have an aspect ratio of 1.66:1. Concerning the sound, TLK will be for the first time ever available with 7.1 DTS-HD Master Audio in English and for the french and spanish tracks in 5.1 Disney's Enhanced Home Theater Mix (DEHT).
Source: disney.com [/quote]
So I assume it will also be available in Belgium in Dutch at 10th of October.