Had mine since their release and there's clearly an issue.
Contacted Apple, after seeing photos of it via the live chat, they agreed that it shouldn't be like that and booked me in for an appointment to get it changed (nearest being Stormfront, Apple Retailer). Get there, expecting a swap, guy looks at it and wants to take it in for a few days to look at it, after agreeing that it was bent. So yeah, I'm gonna use my computer with mind bullets or something?
Take keyboard with me, contact Apple again, get a keyboard sent out. Sent the wrong one, contacted again, sent the right one, and guess what, bent in the middle just like the one I've got. At one point I thought it was meant to be like this, if so, worst design choice ever. Then I found this thread and the reviews for the product on Apple's website.
So, contacting them again tomorrow.
The saga continues.
If this was a £40 to £50 keyboard, I probably wouldn't have followed up on it, but when you're spending £130 for a keyboard because you expect it to be of high quality, its a little disappointing.
PS: Done the ruler thing and done the flipping it over and angling it so the function key row is "supposed" to be flush with the desk and there's a lot of light getting through it, on both my original and the one they sent out. (Good tests btw).