The Tragic Godzilla

Tragic and sad in the plot maybe. 

But definitely not tragic or sad in terms of Godzilla's emotions. I don't feel he looks 'sad'. If anything he looks like he's either minding his own business or he's angry. 

I feel like the emotion is going to come from what happens to Godzilla or how/why he was created, not from Godzilla's feelings themselves. 

From the body language, I guess you could infer this. However, I wouldn't say his face is showing of any sort of emotion, except maybe annoyance.
However, I would love for this to be the case, regardless. A ragic character for Godzilla would be very interesting. :)

maybe he had a bad dream http://www.gq.com/blogs/the-q/Godzilla%202.png

I can see what you mean with his arched forward posture which could convey being miserable, but that's probably just his natural stance, that or he was thinking about Godzilla '98

Godzilla is the incarnation of Nature's fury. He probably symbolizes the sadness of how we as a species continue to hurt the world we live in as well as those around us. I expect there to be many subliminal messages throughout this film, not just another apocalyptic Monster flick.

Well said, Chris.

I think he's just angry that someone always puts a city in his way when all he wanted was to go for stroll.

exactly my point you saw my link right ?