Raviente In MH4?

First topic message reminder :

In the end of the trailer there was a large snake monster about the size of the Raviente that I first assumed was it until I noticed its scales were done very differently. Is this a new subspecies or entirely new monster we have here?
Trailer: (Skip to around 2:45 to see it)

ok guys 2 things not only does wyverns and elder dragons have or get it but wat happens is once the monster is down to a certain amount of health it will die and become infected it doesn't gain health its basically is fighting that monster only it gets harder once gets infected