Case manufacturers getting early 3G iPhone size specs?

Next-gen iPhone rumors are swirling fast and furious, but the latest out of iLounge matches up with what we've heard: the 3G iPhone will be glossy black and slightly thicker than before. iLounge says that Apple has once again provided overseas case manufacturers with details of a new device, and they've mocked up the image above as an illustration, with the old model on the left and top for comparison. There's not much to go on, but we're curious as to what that additional front-mounted sensor is, and we know a few people that would kill for a red iPhone. iLounge says that developers and case manufacturers believe the specs to be correct and have already started work on accessories, but only Steve (and a couple hundred Apple employees) know for sure -- the rest of us will just have to wait.