My guesses from the title were, in order: 1) A new JavaScript framework; 2) something to do with code quality; and 3) a new build system. Probably all related.

I was pleasantly surprised, as well.

If we anything they'd be named something like "ym", "cv", or "ck" if they were Unix tools. I was expecting a new set of JavaScript libraries.

I yam what I yam, said the caveman. Yummy was heard in the background.