While the overall form-factor of the device is similar to last year’s Z Flip 5, including a 6.7-inch inner folding display and 3.4-inch cover screen, SmartPrix reports that its thickness could increase from 6.9mm to 7.4mm, prompting speculation about what the extra internal space could be used for. The front-running theory comes from a GalaxyClub report from last year, which said the Z Flip 6’s battery capacity could increase from 3,700mAh to 4,000mAh. It’s a move that could…