Why would they do this? This means you can't walk into an Apple store and get the full numeric keyboard with your iMac, right? If I understand it, you'll have to BTO your computer to get the full keyboard...hence making it more difficult to return, since you can't return web BTO orders to the Apple stores.
Ehhhh, not necessarily. There's no reason why they'd have to treat a trivial change like the keyboard (something they'd undoubtedly keep in stock at the store anyway) the same as they would choosing between HDD and SDD. We'll have to wait and see how they handle it.