I've run into a Publisher crash yesterday that somehow involved Apple's JavaScriptCore library – I do wonder if that's an indication of something coming up
That being said, I'm still hoping for Python instead of or at least in addition to JavaScript. Having written extensions for different software with both languages, I found that writing extensions in Python was always quick, easy, efficient and even fun, and there are tons of great third party libraries available, whereas any kind of JavaScript extensions, particularly for Adobe programs, have consistently been a royal pain. Getting good integration into the user interface of the host applications (like adding custom menu commands or panels) has never been very robust with any JavaScript-based extensions in any application I have come in contact with. And it's so easy to learn the basics of Python that I believe anyone with JavaScript experience would be able to get started in no time.
I realize that's a rather controversial point and everybody has their own personal preference, but I do encourage everyone to have a look at a few basic Python tutorials and form their own opinion.
