This season has felt like the writers forgot it was the final season until this episode. There were so many detours this season - Tom on the farm, Pope kidnapping Hal, the psycho military captain, Cochise's heart surgery or whatever that was, etc. So, what was a slow season in getting anywhere suddenly has to throw in as many things as possible so they can get to the end. Pope's storyline? Resolved in a 2 minute scene. How will they take out the Espheni once and for all? A deus ex machina weapon provided by Tom's wife. Where is the queen? Conveniently the Espheni stand around chanting her location.
The concept of an Espheni queen sounds interesting and is something they could've done a lot more with over this season, but instead she was apparently created solely for the purpose of giving the humans a singular target (located within walking distance luckily!) that will inexplicably wipe out every Espheni on the globe.