EVE Online's vast and lawless nullsec regions were given a complete overhaul with the Dominion expansion. System sovereignty mechanics were changed, and a new infrastructure system was put in place. Through an infrastructure hub interface, alliances were given the ability to upgrade the systems within their borders. Areas of space near EVE's empire systems that were rarely fought over suddenly became prime real-estate, ripe for conquest and development. The difference in quality between the best systems deep in nullsec and poor systems nearer empire was significantly lowered.
The hope was that by increasing the carrying capacity of each individual system, CCP would cause large alliances to contract into smaller areas of space. The result hasn't been exactly as CCP had planned, since huge areas of nullsec are now being dominated by massive coalitions of alliances. In a new devblog, CCP Greyscale has explained steps that CCP plans to take in order to rectify the situation. The quality of cosmic anomalies provided by system upgrades will soon depend largely on the system's true security rating. Systems that were highly sought before Dominion will now be significantly better for making ISK.
CCP hopes that this will cause high-end alliances to concentrate in higher-end space, leaving power vacuums near empire space for smaller alliances to fill. Player reaction to the devblog has been fierce, with the comments thread reaching over 65 pages, the vast majority of it negative. Whether the changes are a good idea is debatable, but the one thing players have widely agreed on is that the changes will not achieve the goals CCP has set out in the devblog. As the changes are part of the official Incursion features list, however, it's highly likely that they'll go to the live server in a future patch deployment.