Apple may not try to stop you, but as has been discussed in other threads, Apple may choose a "BIOS" technology that isn't supported by Windows yet.
In other words, the mobos may be so new, no version of windows will actually install on the Macs. That is likely to change in a few months/weeks/days after release as SOMEONE will likely do it (either a hacker or Microsoft), but who knows. Difficult to see is the future </Yoda>