In comparison with NSP GK4 brings a lot of changes. The most important are:


Load & Save configuration
Article formats
Images in the links section
Custom link under the links section
10 × faster database engine
New Data Sources API
New Portal Modes API
Support for touch gestures (mobile devices)
Support for comments from Komento and JComments
Support for K2 Store component
Support for HikaShop component
XML, RSS feeds and JSON files as a data source
Support for selecting the size of K2 source image
Support for generating thumbnails from external images
Option to display modal popup window with image
Option to show selected articles from different categories
Support for the Joomla! Update System
jQuery support