I loved the first halo wars and I still play it to this day. I hope and want the gameplay to (like controlling units and making bases to be the same. I think there should be multiple upgrade upgrade trees for units instead of a gun on your warthog you could make it into a fast moving transport warthog and instead of new blood and the other marine upgrades it could be something giving them a commanding officer or add a marine with a sniper rifle to engage enemy units at long range out of there agro. one feature i thought would be cool that uncs main base for 3v3,2v2 or 1v1 like at alpha base and when you lock down the base the covenant forces would have to break through you would be able to put ten units (only marines,spartans and flamethrowers) you could install to turrets inside and on the wall. for the covenant it would be a big shield like in the dome level of and you would have to destroy the shield but covenant forces can shoot out of it. you could repair these but it would take a while and upgrade this air units can go over them in to the base for unsc but ground units for the covenant shield. I cant wait to play halo wars 2 when it comes out I have faith that you can do good on this game.
343 has no control of the development of this game, they would be completely out of their depth with an RTS, as they can’t make a decent shooter. Thats why Creative Assembly is at the helm. So direct wishes to them. As this game is also coming out on PC, it will likely be a lot more complex than HW1, not as much as Total War, but more complex for sure.