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I wouldn't be surprised if apple releases backlit WIRED keyboards. Unfortunately, unless apple can come up with a more elegant way to charge the Wireless KB (micro USB, hell even a dock connector) I doubt we'll see a wireless backlit KB. The battery life on them currently sucks, I wouldn't want them to drain any faster.
 
I have to agree with reebzor. As cool as it sounds, if they can't find a way to use a charger or some sort of different system with a couple AA batteries it'll be a bigger headache than its worth.

Also, when are you really using a desktop computer in a "lower light" setting that would create a need for backlit keys? I only use my backlights in almost pitch black settings. I find that in low light or well lit areas my backlights actually washout the keyboard on MBP and make it harder to see the keys.
 
This would be great news if they do manage to release a wireless one. Maybe they can go back to the 3 AA batteries or even 4 to maximize the battery life.
 
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