According to Cosmic Book News on Jan. 12, it has been said that there appears to be a leaked script of Gareth Edward's "Godzilla" film. An ample amount of spoilers has made its way online and apparently some anonymous user at 4 Chan made the particulars apparent. There is also an archived copy at the Foolz.US site.
Some of the spoilers revealed the origin of Godzilla having been existence since the 1950s. Apparently, the films opens up in 1954. A nuclear warhead which was developed and was launched at the creature. A massive explosion resulted. Further education about the film revealed that Godzilla's rampage had never occurred and only started making his rounds around post-nuclear Nagasaki. It was thought that "radiation had changed him somehow".
Russia and the United states joined forces to take out the creature as a method of retaliation when the beast took out some of the nuclear ships in their fleet. He was never heard from since.
As years have passed, another Godzilla corpse was discovered in Antarctica within the frozen ice, but this wasn't the only giant-sized corpse discovered in the find. Apparently, the the two intermingled creatures are frozen in some kind of battle pose. One of them went by the Japanese name "mutos" and the second creature dubbed, "jira" which is Japanese for "whale". This later brought upon the nomenclature of "Gojira".
Apparently, in the film, a mutos creature escapes from some lab and later winds up engaging with its natural enemy, jira.
Military personnel continue to struggle with the Japanese nomenclature of such creatures and somehow are able to trace them to an appearance they also had made in the 50s. It seems that the early islanders had mistaken one of them as their god. Turns out even Wikipedia noted that the Japanese term Gojira is the truncated version of jira. Thus the name Godzilla.
Apparently, in modern times JIRA is actually a piece of technology used to track bugs in software, but that's a completely different conversation altogether.
Even more interesting, the gender of the mutos also play a significant role in the film. According to the leaked script, they are mates of one another and hunt the Godzilla species usually in pairs. They actually do have an objective, not unlike Parasitoid wasp that lays their eggs inside their prey, these natural enemies of Godzilla attempt to lure him into the fray in an attempt to pierce the sizable lizard with a Chrysalis.
When the encounter of all three occur, Godzilla does manage to thrash about the male relentlessly, but never manages to kill it. The female mutos is a rather more formidable foe.
There also seems to be some other encounters mentioned in regards to bioluminescent creatures, references to this being possibly the sequel to the 1954 "Godzilla" film and Bryan Cranston working at a nuclear facility and apparently he is somehow blamed for a flawed design of the facility causing it to go into melt down. His wife dies as a result and his step children resent him for it. However, Cranston's character believes that this meltdown had nothing to do with his flawlessly engineered design.
"Godzilla" is scheduled to be released on May 16.