There are plenty of case manufacturers that actually printed boxes that say "new iPhone" on them. Most of them have stickers over them to say "iPhone 5", but some were missed. You may still be able to find them in stores.
My point? Case manufacturers do a lot of guess work. They are not given the phone prior to official announcements. With all of these leaks, the guesswork is worthy investment. It's a race to get your product out and compatible with the next gen iPhone. In short, this is no more confirmation that the 5s will be the same form factor as the 5, than seeing no information at all.
I have every expectation of seeing the 5s be the same as the 5 with some rehashed innards. But still, I can hold on to hoping infer some of the things I've wanted until Applemofficially tells me no.