Despite a recent string of down months in U.S. video game sales at retail this year, a new report from research firm Gartner paints a very rosy picture for the global video game industry. When adding in revenues from burgeoning online, mobile and digital gaming sectors, Gartner estimates that worldwide spending on the gaming ecosystem will exceed $74 billion in 2011, up 10.4 percent from the $67 billion spent last year. By 2015, spending is expected to reach $112 billion.