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I'm very excited for dynamic, succinct templating.

If you're looking for 'living' CSS with variables supplied by JS at the time the styles (or responsive queries) apply, there's a polyfill for IE8+ that includes this functionality that you can use everywhere today!

http://codepen.io/tomhodgins/pen/MKWOWW

I don't understand that use case. If you're happy using a JS value to update a style, what's wrong with just updating the style in JS? If you're concerned about performance then you can obviously do things like debouncing anything that changes the style, or you could use a MediaQueryListListener to fire an event your JS listens to when a user crosses over a media query breakpoint.

While it'll be fun to manipulate CSS properties using JS values, it doesn't seem necessary.

It seems like this would let you update lots of styles simultaneously, without having to keep track of exactly which styles they are.