According to the rumors on Faeit 212, it will be a single box that can make one one of 2 models, the Texocrine or Maleceptor it will be $73msrp. http://natfka.blogspot.com/2014/10/more-tyranid-release-details-toxicrene.html
Heres the rumored stats
via an anonymous source on Faeit 212*****
Heavy Support, slight over 150pts
Acid blood, Lash whips, fearless, Instinctive behavior feed
On a large oval base with 10 long tentacles and a face like a lictor.
A 5 wound t6 monstrous creature who is hypertoxic and shrouded. this means any hit gains instant death on a wound roll of a 6 due to a toxic cloud. This includes its close combat attacks and its choking cloud
Choking Cloud; 12" assault1 ignores cover, lg blast. Chocking cloud is S3, poisoned 2+ and against open topped vehicles or any vehicle that has lost a hull point the attack gains armour bane.
Elite Choice: Monstrous Creature, slightly over 200pts
A 4 legged beast with two large scything talons
A psyker level 2, synapse monstrous creature that has an invul save of 5+. It has shadows of the warp and a 4+ save.
Psychic Overload: Warp Charge 2
It has the psychic power psychic overload, which is a 24" focused witchfire. target must take a leadership test on 3d6 and vehicles count as leadership 10, failure causes d3 wounds no armor or cover saves allowed, and a causes a single glancing hit to vehicles, no cover save allowed. The maleceptor can do psychic overload three times a round, but cannot target the same model twice.