## Rails 4.0.0 (unreleased) ##
*   Change Service pages(404, etc). *Stanislav Sobolev*

## Rails 4.0.0.beta1 (unreleased) ##

*   Split Validations and Callbacks guide into two. *Steve Klabnik*

*   New guide _Working with JavaScript in Rails_. *Steve Klabnik*

*   Guides updated to reflect new test locations. *Mike Moore*

*   Guides have a responsive design. *Joe Fiorini*