Intel software emulator lets you test drive AVX-512
 

I haven't tried it yet, but the docs make it sound pretty cool.
Available for all 3: Windows, Linux, & Os X.
[URL="http://software.intel.com/en-us/articles/intel-software-development-emulator"]http://software.intel.com/en-us/articles/intel-software-development-emulator[/URL]
If you try it, post your review back here.

Enjoy!