Looks like Precursors.
A pity I was hoping for the new spoilers
By the way, I'm not holding my breath for the possible success of any sort of probing strikes. Looks like a recipe for disaster in this situation... The alien forces look quite formidable. The presence of AMM is particularly daunting for the Empire's weaponry. Maybe they're on ground based installations though, which could provide an opening for the Empire
I understand, of course, that you are roleplaying here