I want Xandar and Worldmind back! However, I'm not sure I want the Xandarian people back. I sorta feel that story has been done and they got their second chance.
If it were up to me I would have maybe a 50-100 or so Xandarians who were either nomadic or just out in space somewhere come back to a reconstructed Xandar and try to reestablish order and life there. However, a major difference I would add is the last 50-100 Xandarian people would welcome Scientist, Warriors, and their respective families from all over the galaxy to Xandar. Turning it into more of a world whose sole purpose is to gather information, learn, train Nova Corpsmen/women, and is dedicated to protecting the universe. Having its way of life almost become an equal "class system" were people can opt out and leave Xandar when they are of age if they choose to do so.
But those are just my fan wish's. I feel it would give Xandar a unique place in the Marvel Universe. While provide an interesting well to pull stories from. It would also greatly separate the Nova Corp from the Green Lantern Corp in comparisons. Due to being a race trained from birth to protect the Universe.