If they want us to take any of these new corporate languages seriously, they should kill off some existing language support. A strong signal that (for example) Dart was definitively the next glue language at Google would be to end support for Python in everything like GWT etc.
James Mickens has written a number of essays for;login: magazine. The wall-of-text presentation is kind of scary, and the first time I encountered them, I skimmed the essays rather than reading them through. As a result, my reaction was, "I got tired." But if you follow the path and read the essays through, you realize that they are all brilliant.
Everyone collects utilities, and most folks have a list of a few that they feel are indispensable. Here's mine. Each has a distinct purpose, and I probably touch each at least a few times a week. For me, "util" means utilitarian and it means don't clutter my tray. If it saves me time, and seamlessly integrates with my life, it's the bomb. Many/most are free some aren't. Those that aren't free are very likely worth your 30-day trial, and very likely worth your money.