Funny you should ask that because the internet is just now taking a big lurch forward with Canvas and everything in HTML5. Would Objective-J quickly adopt new features in Javascript or stay closer to developments in Objective-C?

Since everything gets compiled down to Javascript in the end (and Objective-J doesn't feature 100% browser compat either) I don't see how they can offer anything not possible with Javascript to begin with. Actually that's a question? I don't understand how it is different than, for example, CoffeeScript - but I would be happy if you could explain how it is.