Unicorns wrote:Will they ever make a Windows 8 64bit version?

Not until there is an official 64bit build of numpy for windows.
It's not that you would notice the difference between a 32 or 64 bit MH, though. It's purely psychological (influenced by marketing talk).
You can rest assured that MH will perform well and use your CPU's fancy SSE/SIMD/vector acceleration features, even in 32 bit. In theory performing 32bit floating point operations should even be faster than 64bit float calculations.
And it's not that MH will ever consume more than 3GB of your RAM.
In short, there would absolutely positively be no perceivable difference at all between a 32 and 64 bit version of MH. So don't worry about it.