A while ago, some internet sites started a rumor Windows 8 would be able to Xbox 360 games. This rumor was shot down quickly as experts confirmed that the current PC technology available to consumers is not powerful enough to emulate the Xbox 360 console (as a rule of thumb, the emulating machine needs to be more than 10 times more powerful than the emulated one).
After digging into Windows 8 kernel (core), Win8Italia seems to have uncovered the first evidence to back that rumor. Specifically, they found the strings "XBOX_360_SYSTEM_CRASH" and "XBOX_360_SYSTEM_CRASH_RESERVED" inside Windows 8 kernel.
Without further info it is impossible to deduce anything. The strings might be there because the rumor is true, but they might also be there as part of a feature that allows Windows 8 PCs to connect with Xbox 360. The strings might also be left over from a feature that was removed later.