Matt,
That depends on how Microsoft is going to release it. If Windows 10 supposed to work on Raspberry Pi 2 is going to be similar to Windows RT (where you can’t install anything besides Windows Update or applications from Windows Store) then the answer is probably no.
However, I don’t see much sense in releasing restricted OS for such device like Raspberry Pi 2 because you just won’t have any chance to extend it with custom hardware by installing appropriate drivers. So there is a little hope that platform will be at least as opened as x86 Windows 10 and we will be able to run custom drivers on it. If it happens then yes, just need to build WinpkFilter for ARM.