Nine soldier classes: Sharpshooter, Shinobi, Ranger, Assault, Gunner, Grenadier, Specialist, Technical and Psionic (plus Sparks for DLC owners), each with unique secondary weapons.
Manage resistance Havens and have resistance members scrounge for supplies, gather intelligence or recruit more people to your cause.
Infiltration mechanics that require you to send out multiple squads at once.
A much longer campaign, running for 100 to 120 missions on average.