In CE Anniversary, they reused a lot of Halo Reach assets and generally dedtroyed the art style of the original game.

In what they have shown of Campaign Evolved (actually comically stupid name), they have added Sprint (which hilariously their own gameplay showcases that sprint causes the player to miss a music cue that Martin O’Donnell specifically placed), removed Health Packs in favor of recharging health, removed the tree that prevented the Warthog from being used to fight the two hunters completely trivializing the fight, and they reused a lot of assets from Halo Infinite as well, which I really hope are placeholders but I fear they are not.

From just 13 minutes of gameplay, I already see a lot of problems.