This should probably be taken with a very large grain of salt, but several sites are speculating that Apple might be preparing to sell standalone backlit keyboards. MacGeneration points out that there are ambient light sensors on the new iMacs, similar to what is found on the MacBook Pro. 9to5Mac goes a bit further and provides a screencap, seen above, of System Preferences showing the option to illuminate keyboards in low-light situations.
9to5Mac is a bit skeptical on the keyboards and guesses that one too many options was copied over from the latest MacBook Pro release, but the site adds that any sort of backlit keyboard from Apple would be considered a winner. Would you want to see a backlit keyboard for Apple's desktops? Let us know in the comments!