Ever since Microsoft confirmed the existence of Project Scorpio they made it clear that the console would support Xbox One games. There's a catch with saying the console would support Xbox One games though, because the Xbox One also supports some Xbox 360 games.
Xbox fans have been concerned with whether or not Project Scorpio will make the cross-generation leap and it turns out that it will. Microsoft's engineering lead, Mike Ybarra, has confirmed that Scorpio will support both Xbox One and 360 games.
360 Backwards compatibility will of course work on Scorpio. #xbox https://t.co/0jtSyIIXaH
— ♏️ike Ybarra (@XboxQwik) November 1, 2016
So, if you're considering on adopting a Scorpio, don't worry, you won't be abandoning your entire game library.