User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-14915808-20130808190807

So i would imagine that symbol in the trailer has something to do with Goa. Maybe it is a monster that was such a threat and it was sealed away long ago or hunted to extinction due to the threat it posed. Maybe it survived and was freed due to some recent activety. Just a theory, all in all I cant wait. :)