Overview of the Ember.js code

Question

I have discovered Ember.js through this article.

A cursory glance at the documentation promises a very impressive tool. A cursory glance at the source code reveals a monster. The "compiled" version of the source is nearly 15000 lines of code, and the GIT repo is full of files scattered around.

I wouldn't want to embark myself in learning a JavaScript framework if I felt I could not have at least a global understanding of the code. (One of the quality of jQuery or Backbone is that the code base is relatively straightforward.)

Do you have any advice for navigating (and eventually understanding) the code?