• Faster dev mode & routing (这玩意儿期待了很久啊）
• Explain queries
• Tagged logger
• Active Record Store

更多详细的更新内容：https://gist.github.com/1499751

Try it out:

$ gem install rails --pre

or Gemfile

gem "rails", "3.2.0.rc1"
# ...
group :assets do
  gem 'sprockets', '2.1.2'
  gem 'sass-rails',   '3.2.0'
  gem 'coffee-rails', '3.2.0'
  # ...
end

$ bundle update rails