In the Kotlin vs Scala section of the Kotlin Docs, Quasars is currently mentioned as the way for getting actor-like functionality.
Quasars also provides lightweight fibers, will co-routines replace / supplement quasars in Kotlin 1.1 as another way of getting lightweight threads / fibers?
Are there any benefits of using co-routines over fibers?
And will co-routines allow you to run blocking code inside the co-routine? 
Fibers currently doesn't like blocking code and works best when wrapping async code or using modified libraries that supports quasars.