Which class are you going to choose?

All of them.

I'll probably go Sentinel first, provided its still versatile.

If not, Vanguard.

Infiltrator forever

First run will be my all time fav - Infiltrator.

Engie. Just because noone else seems to want to start with it. Take that you Winfildierdeptinels!

Soldier. In every singe type of game like this... when ever there is a class option.. I always pick soldier. I like to get a feel for the game before I start really getting into using powers or magic or stuff like that.

I can't say for sure unless I know how much they changed the class system. Assuming it's like ME3 (I doubt it'll be the same) I'll go for Vanguard or Infiltrator.

Vanguard of course!

I'm hoping to play the Adept first for once if they have improved on it significantly from ME3. I’ve got no interest in replaying this class again if it's largely unchanged so we will see.

My main gripe with the current incarnation of the Adept class is that the power selections made sense mechanically in the context of ME2 at a time when all of these powers were new and your options were limited but after two games I’ve basically reached saturation point with the vanilla class as it stands. I understand there are balancing concerns and considerations for unfamiliar new players but at this point there are simply far too many better alternatives locked away as bonus powers and if this continues it would make the adept class feel horribly outmoded and stifling.

In order to overcome these limitations whatever solution framework they come up with has got to incorporate some degree of user experimentation for veteran players in a balanced and user-intuitive way for newcomers. A solution I’ve described before which I hope they come up with themselves is to assign each class power to a designated type of slot. The default powers in each slot are the vanilla ones and as the user unlocks more for each slot they can switch the active slot power(s) in the ship med-bay or combat-training area. For example:

Primary slot: Singularity, Dark Sphere, Annihilation Field
Primer slot: Warp, Reave, Dark Channel
Detonator slot: Throw, Shockwave, Lash*, Slam, Biotic Orbs
Crowd Control slot: Pull, Stasis, Lash*, Slash
Direct Damage slot: Cluster Grenades, Flare, Lift Grenade, Smash
Utility slot**: Barrier, Biotic Focus, Warp Ammo, Biotic Sphere
Bonus Power slot: Any

*Only available in 1 active slot at a time
**Also available as bonus powers for this class

Vanguard first.
Sentinel second.
Engineer third.

Soldier.....never.

If there are the same 6 classes, then prolly Sentinel. My favourite trilogy class. And that Tech Armor.

...
If there's no Tech Armor (darkest scenario), then Infiltrator. Snipe all the things.

I'm hoping they add more definition to each class type like in ME3MP or add new classes entirely. They say their combat is supposed to be refined and better so who knows what they're going to implement.