According to a Reddit user, a bunch of information about Mass Effect 4 has been shared to select members of the public as part of an online survey. We can't confirm the legitimacy of the information the Reddit user or the survey provided, but there's definitely a lot of information to delve into.
Here is a portion of the information that the survey shared.
Premise: Set in the Helius Cluster of the Andromeda Galaxy, removed by time and space from the Mass Effect "Commander Shepard" trilogy and its ending. Play as a "Pathfinder" explorer leading expedition with the aim of establishing new home for humanity. Encounter "savage untamed lands", "cut-throat outlaws", and "warring alien races" in an effort to survive and colonies. Andromeda is home to a mysterious alien race, the Remnants, who've left their vaults and ancient technology throughout.
Game Objective: Explore 100s of solar systems (over 4x size of Mass Effect 3) collecting resources, developing your ship, crew, and arsenal, while engaging in diplomacy in order to set up colonies, while discovering the mystery behind the Remnants and racing to secure their technology.
New Species: Remnants, an ancient race who've left ruins and technology throughout the galaxy. And Khet, seemingly antagonistic.
Squadmates: Same as previous games: make friends, take two with you on missions. Cora is able to generate biotic shields you can fire out of. Drack is a Krogan.
Loyalty Missions: Same as previous games: complete to unlock increased loyalty and new skill tree for that character. Example: Krogan colony ship has been stolen by outlaws. Track down the ship and return it to increase loyalty with Drack. Dialogue trees and end game impacted by loyalty status.
Dialogue: "Meaningful choices". Deeper control over responses, such as interrupting conversation. Action based choices are physical choices to shape the course of conversation, such as pulling out a weapon and forcing them to open a door instead of attempting to do so purely via conversation.
If you would like to read up on all of the information for yourself, you can check out the survey information that the Reddit user posted. Here is a link. I'd love for this information to be true, it all sounds pretty interesting, but we can only wait and see. It's also important to take into consideration that the development of Mass Effect 4 is still in it's early stages - if any of this information is true, it may change before the game is released.