Windows 10 Pro 64-bit; 8GB RAM.  NVidia GTX 770 w 4GB.  Latest (Oct 28) WHQL drivers v375.70.  Running Escalation through Steam.  In both the default DX12 and "safe" DX11 mode, some graphics elements are missing and therefore show as pure black.  The most obvious is the rotating top of the Nexus.  This did not happen in non-Escalation AotS DX11.

Edit:  Other parts that are black:  vanes on metal extractor; rotating part of Constable (except lights are there); non-rotating base of Smarties; base of the Barrage Turret (except for white lights).

I do notice that frequently (not always) Windows will complain about low memory when I start the game.  I always ignore that after making sure no memory-hungry apps are running, such as Chrome, and finding that my favorite system util says only about 2GB is in use, leaving at least 4GB free.