FERMi27 wrote...
I'm guessing there will be the Reaper faction(obviously), the Geth faction(because it has a huge diversity of enemies), and the Collector faction(their presence in ME3 is confirmed by a screenshot from day-one DLC).
The Collectors aren't confirmed in game as enemies. It could be as a flashback: the only picture they show up in has no indication of Shepard or any contemporary actors.
Reaper faction(can't speculate much here since not all enemies are known, but will give it a shot)
Atlas -> Brute
Phantom -> Banshee
Brutes will be more numerous, and likely closer to YMIR heavies than the Atlas super-heavy. While the Banshee does look to have a instant-kill like the Phantom, it also has the build of a support unit, giving Reaper forces barriers: it might well be a hybrid mid-range threat, versus the short-range finisher.
The Reaper forces seem to have a different design philosophy than the Cerberus commandoes, being more about closing in and engaging in melee than combined-fire tactics. Different units will do the same role in different ways.
Guardians are the get-in-close pressure meant to force players to abandon cover, and they do that by being nearly invulnerable from the front. The Reaper equivalent is likely husks, who sacrifice the durability for both speed and a possible instant-kill grapple. They rely on numbers, rather than endurance.
The Cerberus engineers and turrets were area-blockers in particular, but the Reaper equivalent might be the brute. Rather than suppressive fire at range, the Brutes might be endurance tanks, blocking the route and having a heavy melee charge.
Geth faction
Atlas -> Geth Colossus / Geth Armature / Geth Prime
Phantom -> Geth Juggernaut / new stealth Geth enemy
(also the Geth Hopper may substitute the Cerberus' Nemesis, because the Geth Sniper is too weak)
Or the Geth Sniper might get a boost. Bioware's problems with the Hopper would still apply.
The Atlas will be most similar to a Colossus if we get one, but the Geth Prime might be an Atlas-light. The phantoms might not have a real equivalent: nothing yet suggests a Geth with a melee focus.
The Geth will be more about range and tech abilities than melee, most likely. Geth with flame throwers might merge the turret area-denials with the proximity-pressure of Husks or Guardians.
Other than that, it's hard to say. The Geth don't have a clear zone or style yet, though they obviously can make use of tech drones.