Tried to post this before, but forums went boom.
There was livestream during E3, watch the replay here.
2:27 - robot army
2:49 - markings on neck, plus shades, I'm thinking that's a Thinman, also peaceful visitor, yeah right
3:15 - there's Bradford,
4:40 - wanted displays of XCOM soldiers in cities
5:29 - red tiles mean the enemy will discover you, that's handy
5:49 - that doesn't look like human blood from that Advent trooper
5:56 - overwatch now targets different opponents
6:56 - here comes the Viper
8:03 - Advent has turrets
8:40 - aliens can call in reinforcements
9:32 - turrets can be hacked
10:36 - Muton Berserker and Advent MECs, game is not pulling any punches
11:23 - you need to pick up critical health and dead soldiers to get their gear
11:34 - calling an evac
21:23 - the Berserker is female
24:20 - as stated in a previous article the new Sectoid has an ability called PSI Reanimate, this brings back dead alien troops and Xcom soldiers to fight for it. Doesn't that sound fun?