I just dont understand how you'd expect general infantry units to act vastly different from one another...? Even in Star Wars movies and whatnot, the foot soldiers on both sides have a couple different weapons they are shooting each other with and neither force does anything that different than the other.
Like @Undeadguy said, the biggest differences we'll see in the game is when there is more of everything. We know stationary units are coming, so turrets will be a thing, more vehicles are definitely coming, and Im sure we'll start seeing droids here too.