The Las Vegas convention for theater owners kicks off April 13. Though CinemaCon is a trade convention for exhibitors, it has increasingly functioned more like Comic Con in how it gives the studios a platform to show off their slate, take a victory lap on the past year, and schmooze with theater owners from the Midwest. Fan bloggers and film journalists attend to get an early look at superhero stuff, an entire movie or two gets screened, and it’s gotten big enough to the point that “ The Studio”