There is a new stand-alone sci-fi novel coming from John Scalzi early next year: The Collapsing Empire. It sounds rather interesting, too:
Humanity moves away from Earth, into space, and in time forgets our homeworld. It creates a new empire, the Interdependency, whose ethos ensures no one human outpost can survive without the others. It’s a safeguard against interstellar war – and a way of controlling the empire’s rulers. This future of faster-than-light travel is possible due to a huge discovery – the Flow. This is an extra-dimensional field which can transport us to other worlds. And while this field is eternal, like a river, it does change its course.
It now seems the Flow is moving, which could isolate every human world in space forever. So three individuals will make a last attempt to find a solution. A scientist, a starship captain and the Empress of the Interdependency will see what, if anything, can be salvaged. For an interstellar empire is on the brink of collapse.