Patriot Spartan, Nukin since the Start
The terminals seem more for backstory than setup. Dont expect anything to be revealed, thats the point of the terminals to build suspense and anticipation so you will go out and buy it. As for anything that you can surmise.. best guess would be Forerunners who hid in a niche outside of all the Rings blast radius' or some kind of another forge world they built. but hey, who knows? For all we know it could just be the grunt homeworld :D Pre-order and find out!