I've seen very little about Halo 4, but most of it is unecessary changes and additions that just copy CoD. "Halo" gameplay was beautiful on its own; better than CoD's when it was done right. It doesn't need all this crap, and it doesn't add to the experience.
I want a Halo game that heralds back to Halo's origins; the most skill-based and fun console FPS on the market. A simple, elegant game that hides incredible depth through predictable, skill-based game mechanics and features. That's what I want, and nothing I've seen shows me thats the direction its going. In fact, everything looks like its going the opposite direction.