Nevertheless we should also mention some other things. First it is definitely good that many new languages are coming out these days. Of course there are probably too many and some will (and can) never be popular, however, in the end new innovative concepts and tools for solving very special problems will survive and emerge into existing or new languages. Second it is much more obvious that even standard programmers need to learn other languages from time to time. This flexibility will pay off later, when one's favorite language is no longer the tool of choice.
So what do we have to expect from programming languages in 2015? In my opinion the trend will continue and we will see many new (interesting) languages come out. We will also see some newcomers to gain popularity. One of my favorites is Julia. It perfectly fits to some of the requirements for a great language these days. What about functional languages? I am glad that we see innovation going on here, but I think that a pure functional language can never be as good as a language that is functional in its core, but also incorporates other paradigms for flexibility.
That being said I have to draw a conclusion that also mentions C# and C++ (my other two favorite programming languages): C# is becoming more useful each day, which is mostly driven by open-sourcing .NET and by Xamarin's efforts to use C# as the primary language for doing x-plat development. I like that direction. C++ on the other side feels great these days. In a world that requires fast, low-energy consuming programs, having a language that cares about speed, but does not neglect productivity is a great thing. However, the trend is easy to predict: More special languages will partially take the jobs of these languages. Therefore I foresee further reductions in their TIOBE ratings. But that does not say much about the usefulness and importance of these languages.
All in all we should all be thankful about current evolutions in the programming language sector. The benefits of this development will be tremendous.