Haswell-E will be on LGA 2011, or a variance of it with different pinout but similar dimensions, +- several pins, so do not worry about compatibility, any cooler that supports LGA 2011 should work on Haswell-E. I am sure Intel has no interest in updating the mounting spacing even when they bring a new socket (like they did with 1156, 1155, and 1150) to keep backward compatibility of coolers.