New galactic sectors? Umm.... hmm.... one part of me goes "AWESOME!" the other part goes "not gonna happen".

The idea is cool, but they haven't added the tech yet, and I doub tit's a priority. A similar but less expansive, idea is to let Foundry authors create their own mission entry points. These would be objects (such as a new console at ESD or a solar system that wasn't there before in Pi Canis) added to cryptic maps that only appear when someone is doing that mission.