My thoughs are:
Dalamud is a giant metalic control-remote weapon.
On the letter is mentioned we will see the new weapon of empire but for "see" it can mean we can clearly see what is dalamud and not a "weapon", machine, some type of mob, etz.. imperials may use.
In addittion in some old Company quest from Ul'dah (don't remember which, take care spoiler):
Cid appears whispering that Imperials are trying to use Meteor on us.
With thist said is a bit weird that Imperials are using Dalamud to crush our territory but they keep attempting to "invade" or attack us. It looks silly if they get hit too... However since Darkhold instance raid was released, on quest related to this instance and some "live events" (invasions) we are told that imperial are invading and installing some "devices" (little machines) over the zones.
What this can mean? Well guessing the point Dalamud is a fire weapon (let's say a misil so we can understand) it need to have some aiming procedure or it can fall over the Imperial region too. So we can supose those devices are nothing but target points where the Dalamud (Meteor) should hit.
Also if you check the logo, you can speculate over many theorys on what those spikes are but what if they are some "antenna"? So far we saw Imperial are heavy machine technology based so... why not?
So here it is another speculate theory! Have fun, thanks for your time.