What excites you most about it? For me, the description about the new antagonists, the new weaponry and tactics they bring to the game, how they differ completely in gameplay experience from the covenant, how they collaborate in combat and bring a new challenge, how they are smarter than the covenant, and how “the inclusion of these new foes results in the largest single expansion to the game’s sandbox since the franchise began.”
The artwork, though somewhat blurry, looks fantastic, and so does the beginning of the opening level with the Salvage Covenant invading Forward Unto Dawn. The description of the weird flora and fauna and a giant squid amongst a tree-filled habitat (on Requiem) sounds majestic. Not to mention the descending pillars from the inner shell of the Requiem.