Box-office preview: 'Avengers' to assemble $200 million or more

“Avengers: Age of Ultron” is going to be big. Just how big is the question. Marvel’s superhero flick already grossed more than $200 million in its international launch last weekend, opening at number one in all 44 markets where it opened, with ticket sales that were 44 percent ahead of its 2012 predecessor “The Avengers...