Oh boy, I really wanted to see what happens after you get a tier 2 unit out.
I'm trying to dissect the unit grouping and orders from what I can see in that gameplay (and the two other videos). Maybe you can shed some light.
0:40 you selected a unit and it selected the associated squad. Squads appear to be spawning together, not individually. That looked very Company of Heroes-like, so that helps my understanding a lot.
1:02 you control-grouped four different squads. Does that now make them one larger squad, or keeps them 4 separate squads that can still be ordered independently? Am I correct that this is not yet a meta-unit/battle-group, as indicated at 2:44 in the nosoundfx video?
1:47 you hovered over units in control group 1 and that highlighted other units in the group. Is that highlighting the squad or just units of the same type?
2:01 you said since the guardians were individuals you can focus-fire them. But when you gave the attack command it actually looked like your units were given orders to attack them as if the enemy units were a squad, though some units did appear to focus the one target unit. Can you clarify?
2:07 you said "Once I start getting meta-units out..." Then you didn't finish that sentence, but instead looked to be preparing tier 2 builds. Could you please finish that sentence? 
I'm dying to see meta-units in action!!!