WordPress is rolling out a Native Font Stack which is meant to stop loading of external fonts (namely from Google). A very worthy endeavor. I've got this stack now running on mcneill.io toward the same end. I'm fine with the typography, and basically it has simply been a drop-in replacement for the previous stack.
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
See more info about Native Fonts in WordPress 4.6.