Things I am picking up that have been mentioned or not are,
-There is cover, and it is destructable.
-There seems to be a new facility that is some type of officer training school, which gives officers global bonuses for their troops.
-The SHIV(tank thing) seems to be pretty customizable
-Character customization is high, first and last name, nickname, country, race, voice(showing at least 10 options), head, skin color, hair(at least 10), hair color(at least 9)
-Sectoids mind link each other and boost stats(or something)
-Yes that gears of war thing with a terrifying face is a muton. I think they look a lot scarier then the original, and I think that's a good thing.
-Cyberdiscs do the transformers thing, disc to tank, spider to attack but vulnerble, However it seems they have some new weapon dubbed the death blossom which seems to be a large area attack "known to wipe out entire squads"
-One XCOM operative died and it said "because he bit it so hard his equipment is unsalvageable." which is interesting.
-Panicking doesn't seem to be "lethal" based on what they are saying, in terms of berserking and killing friendlies. It says "Panic isn't intended to be an insurmountable punishment for the player, though. We've tried to make it the sort of thing that wont catastrophically end combat for you but it is the sort of thing that you have to manage."
-The sniper decided to not use an action so that he could fire instantly when something enters his line of sight, thus reaction fire.
-AI seems to be pretty damn interesting.
-"Everything that firaxis has shown so far indicates that any "dumbing down" is limited solely to removing over-designed rules. For example, the original's time units have been removed for a simple move + action or double move turn for each unit. The idea is to let the players still make the same decisions move here shoot that, without having to precisely calculate steps taken and type of shots fired in order to optimize that final five percent of combat efficiency.
-"Finally if you're an XCOM devotee from the old days, take comfort in the fact that the hardest difficulty is simply called Classic mode.
-Basebuilding is definitely there, I don't know why some of you guys were thinking bases are static just because of the side view. The hangar and situation room are pre-built, expansions have to be excavated deeper underground.
-Says that the environments are desctructable.
-Ammo isn't a consumable, but they do need to reload which takes a whole turn.
-"Special items like the battle scanner, a line of sight extending grenade, opens up new abilities, etc etc."
-Weapons are determined by class, but items and armor aren't.
-You launch satellites to pay attention to more parts of the world.
-The thin man is similar to the slender man myths, sent as facsimilies to spy on earth. very acrobatic, big movement range. Basketball+++ jumps. Unhinges it's jaw and sprays corrosive fluids in combat. Explode in a shower of acid upon death.
-Possible ironman mode, no ability to reload from saves.