I can draw up fake schematics, too. Really not that hard, if you know what you're doing.
I challenge anyone who thinks this is real, to go back a year and look at the rumors going around about the iPhone 4S design. There was some whacky stuff, and a lot of it was consistent. Everyone slapped their URL watermark over the image and got tons and tons of ad hits. There were drawings, mock-up parts, 3D models, and enough detail that companies were building actual physical cases based on leaked designs. All those cases are now on a landfill.
Apple has prototypes that never become real products. Apple has employees working on fake projects to test their loyalty to the company. Apple has played the rumor game from the very beginning to control their PR and trick their competition.
I'm highly skeptical, especially in light of Tim Cook's recent interview where he talked about fragmentation and screen resolution, and everyone else should be too. Remember that Samsung just released a shiny new phone. Nobody's talking about it as long as "taller iPhone" takes the headlines.
Reasons why this may be fake:
1) Apple makes prototypes all the time to try things out, and this is one of them.
2) Apple is trying to find a leak by putting people on fake projects, and they just found one.
3) Apple is messing with Samsung's phone launch, and this carefully tailored to do just that.
4) Rumor sites need news to get ad hits, and things have been too quiet lately.
5) Whoever did all the fake iPhones hoaxes last year wants to see if people are still so gullible.
6) Somebody believes that if they make a convincing enough fake, somebody at Apple will think it's awesome and actually make it.
Reasons why this may be real:
1) This could be one of those extremely rare times when there's a legitimate leak out of the most secretive company in the world.
Remember folks, nobody left this at a bar. There's no physical device here somebody can hold in their hand. This is just a picture on a sheet of paper. I could draw a unicorn, but that doesn't make it real.
Somebody should study iPhone rumors scientifically. The tendency for rumor sites to report things from other rumor sites as news, and the commissioning of models and mock-ups to add proof is probably perfect as a model for mass hysteria. This rumor has been building slowly, starting off on the least reliable of sites, and getting spread around more and more, faster and faster. Suddenly it's not just one leak, it's many. Suddenly major news outlets are reporting it as news. Suddenly new evidence is showing up every day. Is Apple that much of a sieve, or is this all happening at once because it's a rumor feeding frenzy and everyone wants a piece?