"Just Dance 2014 is the next installment in the Just Dance series. It will be developed by Ubisoft and will be available in October 2013, for the current generation of consoles and the fourth quarter of 2013 for PlayStation 4 and Xbox One. The game was originally leaked on the Xbox Live Marketplace the same day of its announcement. It was officially announced at the 2013 Ubisoft Pre-E3 Media Briefing on 10 June 2013.
The same gameplay is done like the previous installments where the player(s) mimic the on-screen dancer. New to this series are 6 player dances, an 'On-Stage Mode' as well as a 'Just Dance DJ' mode. Another addition is the ability to play with people online all around the world in the 'World Dance Floor' mode. The Wii U version will get a 'Party Master' which is a newer version of the 'Puppet Master' mode from the previous installment, Just Dance 4."
Source: Wikipedia, "Just Dance 2014", available under the CC-BY-SA License.