‘The Mittani’ is an Eve Online player who is the leader of the Goonswarm alliance, an alliance of corporations (guild) that has managed to get 5 trillion ISK through an exploit and has declared all-out war on all players who are not allied to Goonswarm through the Clusterf*uck Coalition. This war, while big, is expected to be smaller than the Great War of 2007*.
CCP, the developers of Eve Online, is hoping for a massive battle between tens of thousands of players but there is no worry from their side. In fact CCP believes this war will help the generally slow period of play that happens during the Northern hemisphere’s summer months.
*The Great War of 2007 started in January of that year and ended in October 2007 with the forces of BoB retreating into “Fortress Delve” and surrendering space to the forces of the RSF and NC.
Eve Online Wiki: http://wiki.eveonline.com/en/wiki/Great_War#Retreat