Tim Bray hinted at it; Ola Bini explains it:
I have a firm belief that the end of big languages is very close. There won't be a next big language. There might be some that are more popular than others, but the way development will happen will be much more divided into using different languages in the same project, where the different languages are suited for different things. This is the whole Polyglot idea. And my take on it is this: the JVM is the best platform there is for a Polyglot platform, and I think we will see three language layers emerge in larger applications. Now, the languages won't necessarily be built on top of each other, but they will all run on the JVM.