https://www.halowaypoint.com/en-us/news/our-journey-begins
3rd paragraph in says enough for me. Though in the same post they do say "new/unexpected directions" & "inviting new players," and at this stage it's impossible for me to know what that means. I can only take my own perspective on the series throughout its history, the developers own words, and fan reaction over the years.
I think it's ignorant to deny fan input in game development. Halo fans by and large want at least a return to a classic art style. The style in the trailer is proof enough that someone in the company thought that was valid input. If the entire look of a game can be influenced, then gameplay conventions can too.
Think it's safe to say it's just going to be Halo but like Destiny. Which isn't a bad thing, i'm not the biggest Destiny fan but they needed to switch the formula up a bit. I think it will be solid.