It looks like someone jumped the gun and posted the Red Dead Redemption 2 preorder page early on the Microsoft store.
The page mentions the following as pre-order bonuses for Red Dead Redemption 2:
• The War Horse
• The Outlaw Survival Kit
• Cash Bonus for Red Dead Redemption 2 Story Mode
• Bonus GTA$500,000 to spend immediately in Grand Theft Auto Online. After pre-ordering your copy of Red Dead Redemption 2 through the Microsoft Store on Xbox, this GTA$500,000 bonus can be downloaded by searching for “$500,000 for Grand Theft Auto Online” on the Microsoft Store.
In addition, pre-order by July 31, 2018 to get an exclusive Treasure Map for Red Dead Redemption 2 Story Mode.
Check out the page here on the Microsoft store. It is interesting seeing that GTA$ bonus that is available immediately. The PS4 listing will likely have some exclusive content and this was probably supposed to be announced next week or at E3 and not on a Saturday evening. Watch the newest trailer for Red Dead Redemption 2 below:
Red Dead Redemption 2 releases on October 26 for PS4 and Xbox One.
Source: God is Geek