Other possible titles:
boy that got away from me...
So what is *XCOM Chimera Squad*? In case you missed it, there's a new XCOM game that's set some years after the events of XCOM 2, in a city where humans, former ADVENT, aliens stranded by The Elders, and alien-human hybrids live, sometimes in peace. XCOM is there to supplement the police force, and investigate weirdness, and do counter-terrorism stuff.
It's a turn-based tactics game that plays very similarly to XCOM 1 and 2. EXCEPT now instead of whole teams moving at once, every soldier is placed in initiative order, generally friendlies and enemies taking turns. Think Battletech.
ALSO, you don't get the big ol' maps that you had in other games, you also don't need to worry about accidentally activating pods before you're ready. Instead, missions take place over 1-3+ "encounters" on fairly small maps. And before each encounter, you set your team up to breach, and using explosives and other buildable items, you can get pretty cool bonuses on breach.
Also also, instead of random and fully customizable soldiers, you get (have?) to pick from a roster of existing people. But they're all sorts of species from human to alien, and they each have a different skill tree to go down.