Yes, the coming Rails 3.1 is going to be bring new library as default: CoffeeScript, jQuery, and Sass.
Given that you can “opt out” of having CoffeeScript and Sass included in your Rails projects by making a minor change to your Gemfile, this faux-controversy is nowhere near as interesting to me as the legitimate RSpec vs Test::Unit debate that DHH kicked off.
However, if you want to grab some popcorn and enjoy the bullshit, the comments on this GitHub commit page are epic. People have even gone so far to produce graphics to express their opinions. Rock and roll. There’s also a significant level of pie-slinging going on on Twitter too. lets quickly go through the details now.
jQuery – Trivial
Given this, DHH’s announcement passed with little controversy since Rails developers had become used to using jQuery and installing the jquery-rails gem anyway. A good move and a progression with the times – awesome.
Sass – CSS (yes) – HAML – HTML (no)