Personally I would like to see an exterior space with trees, rocks, grass, and areas in shadow. The post mentioned better indirect lighting, and updated lighting so it would be cool to see almost a comparison between the gameplay trailer and now. I’m pretty stoked about the game now, hopefully they keep showing us bits of the game even if its just a small corner of a map.
I guess now they have to pace themselves for the best part of a year!
I’d like to see the area from the demo again. That would be the best way to gauge the changes to both the graphics and the engine.
Just a glimpse of multiplayer in action - at the very least show us what form of sprint is going to take us forward 
And something of Forge.
I’d like to see some view models for some of the guns we’ve only seen in third person. BR, sniper, SPNKr, etc. It would also be cool to see any changes they’ve made to things like the AR, cause it looks like a yellow stripe and more detailing was added in the screenshots we got.
I’d love to see some other character designs like Cortana and the Arbiter. It’d be cool to see some of the vehicle designs, too.
I want to see how they want to handle customization in terms of unlocks or a storefront as well as some basic MP gameplay.
Maybe inside a forerunner structure since 343i’s approach was different compared to bungies approach for Forerunners and they said they would be going back to the bungie art style. Also a little multiplayer action wouldn’t hurt. Hope they’ll release the multiplayer beta soon too. I want to see the new armor variants and since 343i is going for Reach level customization it makes me more excited.
I feel like everyone is commenting something directly to do with art style and graphics.
Fair enough on that…
However, I would LOVE to see something that will partially summarise the opening plot/narrative direction. Whatever that something might be.
That would, I think, go a long way toward easing fans concerns about the remnant plot threads from H5 and make people hope the game to be much more, beyond graphical concerns.
Hub worlds. It would be nice to see how players can interact.
I would like some focus on the overall environment of Installation 07. I once heard there were alot of lore heavy envirnments that gave the developers chills. I hope that gets covered at some point, hopefully we get to see the Palace of Pain or that time lock prison thing the Primordial’s physical form was destroyed in.