It is difficult for true scientist to take a position without having all technical details (facts). The announcement that bots invented their own language might just be an unforeseen emergence. The issue and the message for science is that systems equipped with true learning, reasoning and planning capabilities can be only partially designed.
Not only this, there are many examples in real life as well as artificial (specially in the film industry). However, it is good sign for AI. This is the time we need to think on effect on the Acting humanly and Thinking humanly.
It is only a warning sign for those who would choose to develop and deploy without considering, both positive and negative outcomes. Shutting it down now does not mean they are closing the door. Despite public comments, I believe and hope it only means they are re-evaluating the technology and how to build in stronger, moral & logical safe guards. AI will become an important part of our global society, so it is advisable to take a more deliberate approach, which I think they and others will.
Come on, no it doesn't mean anything. If you had checked what the actual language looked like, it didn't even have a concept for numbers. If one bot wanted to trade N amount of something, it would say a special word N times to indicate that - and it was understood, it was clear, it was just far from how we communicate - because it is a stupid way to communicate.
As Imre mentioned, reasoning and planning capabilities are key concepts of AI and general intelligence, not making up a ridiculous language.