1. PLAYER HOUSES - Different locations, expand with blueprints, unlock by completing a task for the owner, can display items and artifacts, personal vault, postmaster and bounty tracker, unique backstory for each location
2. SHIP INTERIORS - Similar to houses, different ships have different interiors, some are big some are small, lots of customization, banners, trinkets, machines other things
3. NEW LOCATIONS - Use the empty areas on each planet, put a small outpost with npc's, special missions, rewards, each with unique characters that give story info
4. NEW ACTIVITIES - Knife throwing, skeet shooting, brawling, sparrow races, puzzles, gambling
5. IMPROVED SOCIAL EXPERIENCE - Proximity chat, raid/fireteam finder, auction house, trading
6. EXPANDED TOWER - The player houses might just be apartments in the tower in different areas not used by anything else, districts for each class, faction
7. VEHICLES - Customize sparrows with parts, emblems, new colors, make them unique, put emblem on ships.
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The whole proximity chat while in theory would be cool could get annoying real fast. Destiny is meant to be played with friends and not some guy you walked by in the tower that says your character looks gay. Would really downgrade the experience of the game in my opinion