OK, I know this question is remedial, but since I just started 2.0 last week. . .

It seems "Secondary Weapons" are now "Special Weapons." And there is a special "Special Weapon" subcategorized as Ordnance.

Ordnance gets NO range modifiers for attack or defense.

Other special weapons (cannons, etc.) do get the usual range modifiers for attack and defense like a primary weapon.

Is this correct?

Correct on all counts.

Ordinance is denoted by an icon on the weapon card. It's the little rocket shape next to the range indicator.

Here is a better look at the missile icon.