From the post:
While the hundreds upon hundreds of weapons, suits of armor, and items in Starfinder Armory, can technically exist in a vacuum (space joke!), none of them amount to much without a skilled user. The final portion of Armory is devoted to new class options, many of which help characters leverage their shiny new items to even better effect. Plus there's a new archetype that brings the Augmented, a growing cultural movement of self-modification, to any character who wants to hack their body to perfection.
Envoys get a slew of improvisations and expertise talents that make them even stronger team supports, granting allies extra actions to quaff serums or reload weapons. They can also become even better battlefield medics, demolition experts, and computer whizzes!
Mechanics learn new tricks and even get additional drone mod options: you might teach your drone the Barricade feat or install cybernetic or magitech augmentations into its chassis. What's magitech, you ask? A new type of augmentation with dozens of options, included in Armory!
Mystics forge a new connection, which introduces two new spells