Spying is when a spy decides to sneak into a settlement, to see what the enemy have available for battle. Here, you can see the armies that the enemy have, and the spies that are currently infiltrating that settlement. The next log will be about the system of diplomacy.
The infdev screenshot is from turn 151, where 3 different spies from 3 different factions are spying on a Ebrum army, with 3 out of seven of them over 50. With the Kirby event recently happening, a 16-year old Tuff leads the army mentioned, with a 64 year old faction leader, his 66 year old brother, another brother who is 68, and three kids, aged 27, 25 and 22 respectively. New Units Mentioned: Human Double-Sword: Similar to the regular sword, except they are now dual handed with swords.
