“There’s plenty to get excited about here. A few of the headliner features are:”
• Brand new router with an emphasis on RESTful declarations
• New Action Mailer API modelled after Action Controller (now without the agonizing pain of sending multipart messages!)
• New Active Record chainable query language built on top of relational algebra
• Unobtrusive JavaScript helpers with drivers for Prototype, jQuery, and more coming (end of inline JS)
• Explicit dependency management with Bundler
Full details