Yes the OS can do some of the legwork, but the software has to be able to take advantage of all of that processing power by knowing that it can launch 11 rendering threads and keep them all in sync.
Rendering doesn't do it this way, from what I've done multiprocessor rendering on my own time. The way these are rendered (usually), is that each processor is given their own frame to render, or the renderer does its job in buckets/tiles, whereas every core has its own tile to render from the final frame.
But the people who will own these, will probably have software that takes advantage of said amount of cores. I've had the first Mac Pro model ("only" a quad-core 2.66GHz Xeon 5150), and it's still blazingly fast after nearly 4 years.