Is that loads and loads of ships at the back?, if so ouch
They look like the swarmers that you see in the battle zone. If that's what they are, they're not all that big, like 4-6 meters long maybe? The kill accolade they contribute to talks about automated defenses, so they're probably just drones.
It's good to see something totally different and creative being added. Legacy of Romulus did this in bucket loads. I mean whoever amongst you came up with the idea of giant tripods walking across an ocean, while being attacked by ships overhead deserves a raise. It's scenes like that which make blockbuster Hollywood movies, and LOR was full of moments like that.
I really have high hopes for this new update, it certainly looks like it's going to deliver something equally (if not more so) amazing!