The fourth generation of Gantry introduces a selection of new and desirable features to its arsenal, such as a responsive layout.
Gantry v4 effectively offers several main new features: a responsive layout, an improved administrative interface, LESS support, as well as general performance/optimization enhancements.
The standard features such as per-browser-level CSS and JS control, built-in AJAX and many others are still available with Gantry v4.