Très sympathique comme réponse 
J'avais lu les notes des devs sur leur site hein 
Nan mais t'as vu un peu la gueule de leur patchnote et leur FAQ 
Alors oui c'est beau et bien présenté et tout et tout mais quand je dis que ce n'est pas clair...
Il a fallu que je check le patch note sur steamDB qui n'est pas la plateforme sur laquelle je possède ce jeu pour savoir que :
la seule chose qui n'est pas gratuite c'est la nouvelle map
FREE DECEMBER UPDATE
Along with the contents of Part One for the paid Expansion Pass, the following free updates were applied to the base Survival game.
Complete Loot & Resource refresh. All loot tables have been updated, and the location of in-world spawned objects has been refreshed. The locations and amounts of all high-value Tools and Items have also been modified. Do not expect things to appear in the same place, or quantity, as you may have experienced them before, and also know that an element of randomness to loot spawns is present in any game. Interloper balance has been preserved in the loot refresh. (Additional details below.)
Starting Spawn Points refresh. When you start a new Survival game, the locations you can potentially spawn in each region have been changed. Feel lost again.
Visor Notes (Mementos). Notes will occasionally spawn under car visors (and other places). Finding these will unlock the location of supply caches or other items in the world.
Improvised Crampons. You can now craft your own. Be cautious, Survivors ; these Crampons are not quite as effective as the ones you find.
Doe. Female deer have been added to the game, replacing the majority of the Stag population.
