The Sansha incursions will begin with wormholes opening into every system in the target constellation. Sansha forces will form blockades at the stargates, replace the local NPCs in asteroid belts and begin to set up a series of military outposts. Sansha's Nation brings a frightening new technology to each incursion, capable of causing a number of debilitating effects on every pilot in the system. Ship resistances and damage output of all ships will drop, making it difficult to run missions or explore while the incursion is in progress. Similarly, cynosural fields will be blocked to prevent any capital ships entering the system.
Skip past the cut for a run-down of how we'll tackle the Sansha invasions coming with the Incursion expansion.