It's been proven to be false. The rumour came from here and the guy posting bragged about how easy it is to fool the media and deleted his account.
Been all over the net
I believe it's costumes, alternative classic soundtrack and possibly a weapon or two (that you won't use once you've got upgrades story weapons ) so it depends on if you like that kind of thing
Rumours abounded the whole series is heading to game pass so save your money for now.