I really hope 343I creates brand new maps from scratch specifically made for Infection.
Where you can open doors to new areas with progression, activate traps, collect parts to make an power weapon that is strong against flood or infected players.
And hide easter eggs around the map, like: if you manage to parkour your way to this secret location you find the HCE magnum and shotgun.
And this new teleporter equipment would be really fun to use in a better infection.
Crossing fingers for a more content rich infection gamemode.