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Who cares? Pick one that sounds fun, and do shit. Even if that trend flops, you'll have some transferrable skills. The language/technology itself isn't as important as the domain knowledge and experience with concepts that the language/tech embodies.

Node.js

Node is also -- and this is important -- fun.

JavaScript may not be your cup of tea, but CoffeeScript is a nice way to program. The community is great; pretty much all of the open source code is on GitHub and there's a strong "jump in and start hacking" vibe. You can do some really neat stuff with socket.io and a bunch of miscellaneous technology. Just jump in and start hacking. It's easy to learn a lot by accident this way.

Any pointers to good Node.js code in CoffeScript?

My money's on Lasso/FMP