God everyone wants playable flood or just a general more maps. If I were to add only ONE thing it would definitely be a "Terminal Moraine" remake from Halo Wars 1. That map was simply one of the best 2v2 maps ever made. You have your standard 2 sides of the map with a spare base on each corner for each player, then on either side of the center of the map, two self sufficient bases. Each only accessible by air or by the single light-bridge which periodically activates and deactivates. The base area containing two mini base slots and a reactor (From HW 1) which could easily be replaced with a power node, plus two marine covers to protect the bridge. Basically it made you choose if you want to cover the mainland or invest in a base that will be incredibly hard to beat and fun to defend. If this isn't possible, then definitely the "Prophet of Regret" as a leader. He was such an OP leader in HW and definitely would be nerfed if converted to a HW 2 leader but thats all we need. We have Forge, the Arbiter and Plenty of Brute Chieftan wannabes but no prophet. He could be a really offensive Covenant/Banished leader with 2-3 beam abilities plus some other unique abilities and have some alternative version of Elites as infantry or a special unit. His upgrades can be the exact same from HW1, Fuel Rod, Drones and Flight. All this off the top of my head but im sure it could be done, probs better than I described!