A new, longer Weibo video comparing a purported iPhone 7 and an iPhone 6s shows extended views of what was seen in a much shorter video last week, seeming to confirm that the new device lacks a 3.5mm headphone jack and features an updated camera, redesigned antenna lines and two speaker grills. The new video also provides one new update: The new phone still has a mute switch just like the iPhone 6s, contrary to other leaked photos that showed the…