I was at CssConf AU when Simurai gave this talk, and watching the videos of him dragging around elements in the inspector and flexbox just automagically adjusting the layout made me realise I needed to learn Flexbox yesterday — very inspiring stuff!
For what it's worth, all the videos from CssConf AU 2014 are now available — http://2014.cssconf.com.au/news/videos/ — there's some fantastic talks there for anyone who works with the web.
Yes! Flexbox is so awesome. This is a good place to start seeing what it can do: http://philipwalton.github.io/solved-by-flexbox/
I recently got to implement some sticky footers with Flexbox and it feels sooo good.
Very nice. I liked the CurrentColor thing. But I'm so much into SASS right now...