So... second dataslate is now out and it's a doozy.
Incubation node - a bit of a false economy. Yes, it's an extra tervigon, and yes, rerolling ones on the spawning roll means more little bugs. But it also means more likely to run out.
Skyblight swarm - a flock of flying monsters plus two units of respawning, super-scoring gargoyles? Yes please!
Bio-artillery swarm: Twin-linked exocrine and biovores. Nice!
Endless swarm: Respawning gaunts are fine in theory but have to trek across the board again before they can do anything except feed the enemy more kill points.
Synaptic Swarm: Having trouble with synapse coverage? How does three squads of mini-swarmlords grab you? (Note: swarmlord's outrageous psychic and mêlée badassness not included)