I want the terminals, whether they are text, audio or video to be much harder to find than they were in Halo CEA. Halo 3 made them pretty tricky to find compared to CEA, and even in Reach the data pads were in my opinion a little tougher to find. Also what kind do you guys want?
Edit* I want them to be more rewarding when you find them and more mysterious. The videos in CEA were cool because it gave us actual video into Halo 4 when we knew nothing about it. (Not that they showed anything revealing) But I want a return to the old mystery that Halo was, I think text based terminals may be the best to go.