We now know that a Vietnamese site which said it had used a real iPhone 7 and made claims that the device would be capable of shooting 4K video at a silky smooth 60 FPS, was lying to us.
Apple's just wrapped up its iPhone 7 presentation, press releases are up on the site, the store is back online and we can clearly see that the iPhone 7 Technical Specifications webpage states in black and white that the much-enhanced camera system on both new phones still captures 4K video at 30 FPS, just like the iPhone 6/6s series.