Yup, Microsoft pulled the same trick as they did to Original Xbox owners again. Aka, announce a console, then after a short period of time announce a second console, radically different and hence by definition incompatible.
Dude, despite the significant upgrades in hardware it's still ultimately just a bunch of x86 CPU cores paired with DirectX compatible graphics running the same OS. It's being presented as a mid-gen upgrade with 100% backwards compatibility, with custom profiles being generated for each and every existing game to ensure that compatibility. No, it is nothing like the Xbox 360 launch.