Iron Man 3 opens the 2013 summer blockbuster season on May 3rd. This season (as with a few in the past decade) appears to be loaded with geek-favoring titles that should keep the trend of Hollywood success going strong this summer, but one does not have to wait four months to get their geeky fix in at the cinema. Here are 12 movies due out over the next few months to keep us occupied until summer.   Hansel and Gretel Witch Hunters January 25 Jeremy Renner and Gemma Arterton play the grown up variations of the child heroes. They got their taste of witch blood early. Now they’ve taken their skills to a…