Humans aren’t the only species that can be Husk-ified.
ME3 begins with Earth’s assault by the Reapers, and things don’t look so good, but there’s something that is a silver lining, that makes it look like it’s actually possible to not lose against the reapers.
TIM has sent his top agents to take down Shepard, The combat is going to be much harder and melee attacks are going to have more focus.
Shooting specific armor parts can have certain effects, and the AI of the enemies will have them routing Shepard and will coordinate with each other
Battlefields are going to be a great deal larger, and combat will be very varied.
Enemy Weapons can be picked up. Soldiers can carry all kinds of weapons, and other classes understandably less so.
There is a larger skill tree and RPG aspects are going to be more integrated.
Weapon Modding is a greenlight, with things like barrels and scopes
Modding your weapons will vastly affect their appearance and how they function in battle
So far the CONFIRMED SQUADMATES are: Ashley/Kaiden, Liara, Garrus, and James Sanders who is mentioned is an Alliance Marine
Species Loyalty cannot only get obtained via Quests
Levels will have ladders
Available Squadmates will still maintain a balance, if per say Garrus had not survived ME2′s events
Mass Effect 1′s decisions, such as sparing the Rachni, will have a grave impact in ME3
There’s no railroad to the end of the game, there are multiple paths to take back Earth.