Only 1-5 in 10,000 people can do this!

Can it be learned? Yes and no. You can learn relative pitch, where given a baseline for comparison you can identify the interval, and if you know that pitch the baseline is then that means you also know what off pitch the note is. And you can memorize a few good baseline pitches -- I use an F, the first note in one of my favorite songs. Together this means you can act like you have perfect pitch, but it's not exactly the same thing.