So to summarise, SC4 started out as an MMO space sim.
Now its an FPS and potentially a RTS type game?
(As well as single player space sim eventually?)
I cant even understand how are all these elements are linked. Confoozed!
SC is a first-person universe, everything is done first-person and upon joining/connecting it'll be seemless transitions moving between on system and another, between flying a ship, landing, getting out and walking around a planet or large spaceship etc and so on.
What you do while in the game is up to you. You can be a trader (economic transportation game), a fighter pilot (space pilot game), a soldier (fps), racing pilot, explorer, pirate, paramedic, scientist, commercial pilot, bounty hunter... its what you want it to be, and its all set to be within a rich and diverse universe/multiverse.
You can be whatever you want, whenever you want. So if your playing with a few friends, maybe you haul goods around for the $$$ and they help escort you, when they log off, you jump into another ship and go looking for wanted criminals and bring them to justice.
As long as you weren't spotted doing illegal acts in a UEC partrolled area, putting a bounty on your head, you should be able to swap roles at absolutely any point.
I wouldnt call it RTS though, there should be the ability to captain a fleet from afar i guess, but its not an RTS any more than Battlefield would be because it has commanders in it ordering people around.
Also, 3rd person is available too, with slight disadvantages (its more for cinematic purposes, than intended to be an equal gameplay perspective).
The only genre Star Citizen falls into are space sim and massively multiplayer, what you do in your time is your decision, theres no skill trees, no experience points, everyone is equal. Be what you want to be, when you want.
edit: to shoehorn the FPS aspect in clearly, theres an 'FPS' module coming soon called Star Marine which is an in fiction combat simulator, exactly like Arena Commander but for training soldiers.
So right now, as well as when the full game is released, you'll have the option to compete in simulated combat games a bit like we'd play ARMA or some flight sim game today. It'll have entertainment purposes, as well as competitive and training purposes.
That said, its a first person universe, and if you want to pull out you gun and shoot people, you can, with all the repercussions that come with it of course. So the whole game you can play exclusively as a soldier for hire if you wanted. If you just want to be a fighter pilot, or a medic etc then just be that, but there will be thousands of people in the game, and 10x as many NPCs doing their roles in just the same way, or doing absolutely whatever they want. So if you take on a mission to restore a space station to be operational and wipe out the hostiles who've taken over the location, it'll involve some FPS in a natural way.