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First I would choose an engine which can properly deal with latest graphics standards like DX11, offering tesselation and latest shaders for realistic graphics and dynamically changing light to achieve a look which is as close to the movies as possible.
Options: Unreal, Cryengine, Forgelight
64 bit only, PC only. Give 32 bit OS the boot.
-> BASIC DECISION
Then I would declare the mission statement, RPG meets GTA IN THE STAR WARS UNIVERSE.
Action combat, skill based, Skyrim style.
Start out with maybe 3-4 iconic planets from the movies but make them big, round and epic in size and visual appearance.
Kashyyyk, Dromund Kaas, Coruscant and Tattooine. Combine procedural generation with handmade assets.
Day/night cycles, standard.
One planet added with each paid DLC every year. Hoth first DLC. Endor second. Then Mustafar.
NPC AI: Animals roaming around can be tamed as pets, mounts or killed for ressources,
Human NPCs have their cycles like in GTA, talking and interacting see GTA V for reference
No classes, an open skill system.
Achieving Jedi/Sith and using lightsabers as hard and mythical as in SWG.
Races: One added every year. Starting races: Human, Togruta, Wookie, Droid, Twilek.
Open world housing in capital city skyscrapers and outskirts. In cities instanced apartments, outskirt areas for house building and guild cities. Inactivity of 6 months, your house gets removed and put to your inventory.
Cantinas and casinos with minigames. Holochess, Pazzak, Betting.
Bounty hunting missions: Take missions to hunt down players or NPCs in space and on ground
Mounts: Speeders. Real speeders, real fast, open world racing like in Defiance with the ATVs.
Customizable and upgradeable
Fighters: Different "Snowspeeder" type flying mounts
Jetpacks for Bounty hunter specialization
Space ships: Seamless going from ground into space. Fully customizable interiors like SWG had. Minigames on board like Holochess.
Space stations and mining, a fully fledged space sim with trading and mining and open space PvP as it happens.
Plus PvE scenarios like run attacks on stations, do escort missions, plan assault on a star destroyer or even the Death Star.
Oculus Rift support on launch.
Make it happen Disney. Thanks.