I'm embarrassed that so many android users just scream "gimme" when a dev demos a potential new feature.
Look people he hasn't shown any gui for activating or controlling this, just the final output. That means it's probably not done yet, he may have just completed the coding for the actual function first to make sure it was possible before doing all the settings ui that a finished product requires.
Also all this stuff is open source so your ROM maker of choice can incorporate it if they like. I use CarbonROM for that very reason.
Just thank the man for his hard work and let him release it when he wants instead of whining about how soon you can get it.