Definitely looking forward to this as well as other new ES6 stuff. There's something else I feel I could use perhaps even more but I haven't seen it in any of the ES* updates. I'm a huge advocate of DRY and it bothers me when I have to code something like:

  var a = objImUsing.prop.someLongName > 5 ? objImUsing.prop.someLongName : whatever;

I can and sometimes just make an extra variable above for a long prop list like this but that adds an extra line. I guess what I would like would be some sort of implied line limited scope:

  var a = objImUsing.prop.someLongName > 5 ? _1 : whatever;

_1 referring to the first mentioned value in the immediate parent statement.