So after watching the teaser I wanted to get peoples input and opinions. My opinion of what will happen judging strictly from the video shown at E3 is this.
The giant structure you see is Onyx. Chief gets on the planet does his thing and eventually finds the other spartans. As for him showing his face... That I don't not know lol.
That's all I can guess from the short video we all should have seen by now. Give me your opinions ladies and gents.