Just as the name suggests - it's ombre, but softer (or more subtle).
Lots of celebrities have ditched the obvious ombre, and have opted for a grown out summer color, a subtle graduation from roots to ends, a change that is so small but it still makes a big difference.
The color gradually fades from top to bottom, much like a little kid's long hair gets those gorgeous, naturally lighter ends in the summer. It's a look that seems more refined and extremely easy to keep up with.