This is 100% a true thing. In Germany they accidentally put up information about it on the offical game site. But it was removed after a few minutes. I manged to get a screenshot and a bigger picture from the promo art:

(
https://picload.org/image/ripgapla/unbenannt.jpg)

(
https://img4.picload.org/image/ripgapwl/2.jpg)
EDIT:
Translation:
Shipping now:
- very detailed resin-statue of Bayek and Semu (73 cm). Numbered by Ubicollectibles (1-999)
- big collector's case (57x44x40 cm)
- certificate of authenticity for collector's, numbered (1-999)
- exclusive replica of Bayek'S eagle-scull pendant made from resin
- exclusive Steelbook, only available with the Collector's Editions "Dawn Of Creed" and "Dawn Of Creed" Legendary Edition
- four big lithographs, signed by the artists of the Ubisoft-studio montreal
Will be shipped on release date:
Physical content:
- Gold Edition with Season Pass and Digital Deluxe-Paket
- Artbook
- map of the world
- two original artcards
- offical game soundtrack
Digital content:
- season pass
- digital deluxe-paket contains:
- exclusive mission
- 3 additional skill points
- desert-cobra Paket (armor, weapons and shield...)