ES6: var a,b,c; [a,b,c]=[1,2,3]; - destructuring assignments - Is that something coming soon?

There's no plan for it right now, but it's definitely worth voting for on the ES6 wishlist.

The issue is that as you mention "sometimes nothing is better than not all..." - while I'm sure most people would prefer to be able to use it in a simple way, if other features are anything to go by it's pretty much guaranteed I'll get "obscure feature X isn't working" bugs filed based on it, so if I implement it I'd have to be pretty clear about what was implemented.

Also - to be sure I don't get your hopes up - this is another ES6 feature that's really unfriendly to implement in Espruino's parser, because you don't actually know whether [a,b,c] is an array or a destructuring assignment until you get to the = sign.