It could be a coincidence or the sign of a trend. Given that I've noticed a common theme in some other mediums leads me to believe it is the latter, though.
It makes me wonder what tools professional trend watchers have in their arsenal. Within a medium I imagine it is easy -- working in the games industry I have a pretty good idea of where to look to track these trends as they apply to games. For movies, TV, books (etc) I have less of an idea. Harder still is to track trends across multiple mediums.
How nice it would be if all forms of entertainment were tagged so us amateur trend watchers could just refresh the tag-cloud and see what stands out the biggest and boldest. I imagine such a tool (were it publicly available and powered by users) would put some marketing folks out of work.