Here are two more screenshots of the Godzilla 2014 trailer showing even more detail of the new Muto monsters Godzilla will be fighting in the reboot. The first a winged muto diving into the ocean, revealing detail of the wings and what appear to be legs or tentacles. I wonder what weapons, if any, the Mutos possess to knock the fighter jets out of the sky.
The lower picture shows an up close shot of a Muto face that looks very like the "Tremors" monsters or the bug-aliens from "Starship Troopers".
We do know that the Mutos are ancient creatures from the same time period of Godzilla when the Earth's surface was ten times more radioactive than it is today. We learned this from a toy description on the back of the package. We also know they are "bolstered by man's technological arrogance". They most likely possess the ability to absorb and redirect nuclear energy much as Godzilla can. I imagine we will see a scene of a swarm of smaller Mutos attacking Godzilla, perhaps to drain his energy, much like the scene from "Godzilla vs. Megaguirus" It seems clear that the Mutos are shape-changing monsters with juvenile and adult forms like Mothra or Hedorah, the Smog Monster. I can't wait to see the action on the big screen. Godzilla opens May 16.