So this may have gotten lost with all the new Imperial knight stuff but the new tyranid data-slate is amazing and as predicted is a must buy. Endless swarm, and scoring gargoyles finally. Here are the formations:
1 tervigon
3 termagant broods
Tervigon rerolls 1's when spawning
synaptic swarm
1 tyranid prime
3 tyranid warrior broods
18" synapse range
Skyblight Swarm
1 winged tyrant
1 hive crone
2 harpies
3 gargoyle broods
gargoyles have the endless swarm rule (when a unit is destroyed an identical unit is put into ongoing reserve on a 4+)
gargoyles also can control objective markers even if an enemy scoringh unit is in range of it
living artillery node
1 exocrine
3 biovores
1 tyranid warrior brood (must have biocannon)
All ranged weapons fired by models in this Formation have the Pinning special rule. In addition, models in this Formation that are within 12" of this Formation’s Tyranid Warrior Brood can re-roll the scatter dice when firing weapons with the Blast or Barrage special rule