It would be amazing if they expanded the region's of the planets we can explore such the ruins of Europe. Olympus Mons of Mars. Where there could be a huge Vex Fortress's your supposed to attack for certain reasons.... Or the Cabal drop site were they pretty much claimed the planet. The ruins of the moon, the battle for the ocean cities of Jupiter, or the Frozen wastes of Pluto to Space combat in the void of space to possible contact with different solar systems long cut off till now that have been resisting barely through the ages.