Andy Lindeman gives a quick tour of Rails 4.0. Some highlights:

* Rails.queue
* strong_parameters
* Turbolinks
* Russian Doll Caching (cache_digests)
* ActionController::Live (streaming)
* PATCH verb
* Routing concerns
* Extraction of activeresource
* ActiveRecord::Relation changes and improvements
* Removal of plugin support (not gems; only those that are installed in vendor/plugins)
* Removal of Rails 2 finder syntax
* Deprecation of most dynamic finders
* Deprecation of eager-evaluated scopes

Slide deck:

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