Neil Clarke draws mostly from the major SF publications like Asimov's, Analog, Lightspeed, Uncanny, and his own Clarkesworld, to give us a wide range of SF (not fantasy, mind you). There are notable stories from anthologies also such as Sinopticon (Chinese SF) and Make Shift: Dispatches from the Post-Pandemic Future (4 stories).
While other 'best of' anthologies focus on both SF and fantasy, or just fantasy or horror, this one sticks with the hard SF. It's SF that may seem sort of fantasy-like, but it's got a plausible science behind it (even if that science doesn't exist yet).
As always, Clarke's introduction offers a knowledgeable and perceptive look at the state of SF short fiction in the past year.
There are 31 stories here, and a Recommended Reading list in the back offers more suggestions, especially for things like novellas that are too long for this book.