Here ios what the Developers website says…Star Citizen is a First Person MMO Space Sim that covers combat in ship & on ground, economy and pretty much anything else you would want. It’s First Person and built in the StarEngine (a modified Lumberyard Engine). You’ll see massive Space Ships that you can fly with friends, land on planets, explore or pirate your way to whatever goal you choose.
Squadron 42 is the Single Player Campaign and the Spiritual Successor of Wing Commander. The Idea is the game is maximum pretty and seamless… NO LOADING SCREENS. It’s currently in the Alpha of it’s open development with the hope that SQ42 will be released Q4 2017 – Q2 2018.