On August 14th and 15th, OSTraining hosted an event called Joomla3 Day. During the event, several people from the community did presentations on various aspects of using Joomla.
One of the presentations was an hour-long presentation on the new version of K2 which is now in beta stage. The stable version of K2 v.3 is set for release late September / early October 2014.
In the presentation, Fotis Evangelou, main developer of K2, goes through K2 in general and then goes into detailed explanation of K2 version 3.