New PVP/PVE game mode, Left 4 Dead Versus style, 3 Tyranid players vs 3 Space Marines

A true curiosity, a brand new game mode, which is PVP/PVE, this would mean a unique experience. The base idea is from the Left 4 Dead Versus game mode, but the devs need to synchronize it, with the ecosystem and infrastructure of SM2. 

Read and support also my comprehensive forum thread solving the number on problem in PVP, and the 7 Tenets of how to improve PVP (this new game mode is an element from it): PVP number one problem, 7 Tenets of how to improve PVP

3 Space Marines are fighting against 3 other gamers, who are playing as Extremis-tier enemies. The original idea is about Tyranids, but could be supplemented with Chaos Extremis forces also. 

On the Tyranid side you could play as a Lictor, Ravener, Zoanthrope (one player would control 1 Zoanthrope), Biovore. 

As is the original Left 4 Dead game, there would be normally Minoris enemies (hormagaunts, termagants), which the AI would control, but the Tyranid players could direct them. The game would be in a PVE setting, but with real players fighting the 3 Space Marines as Extremis enemies.

The models/animations are already in place, the only new thing would be to control the Tyranid characters. This would be a gem regarding game modes, also a new aspect of SM2, because you could play this, with your friends also, so the 6 of you could contest in this hybrid environment.