The newest EVE Online dev blog provides a wealth of information on the incursions that will be occurring in the game's upcoming expansion. CCP Ytterbium gives some sound advise in the entry: "Incursions are full war assaults, treat them as such." The Sansha's Nation will be invading systems anywhere at any time. Certain system-wide effects, such as reduced shield/armor resistances, will affect all players in the area. Players will need to group together to defeat the threat and earn rewards like ISK and CONCORD loyalty points. Many more details can be found in the dev blog.