Why should you care about ES6 (the next edition of JavaScript)? Won't you have to wait decades in order to be able to use it?
No, for three reasons.
Node.js uses a relatively up-to-date version of v8, the JavaScript engine from Chrome. The Chrome team participates in TC39 (the committee that makes JavaScript) and is tracking the progress of ES6 very closely.
If you're using node.js, you can already start taking advantage of some parts of ES6, and will probably be able to use all of the ES6 features once it is standardized in 2013.