As we saw in ebay two days ago, there are still physycal promo cds being send...
About the digital, any stream can be recorded, the only thing you need is a double jack stereo wire to connect the line out to the line in of your soundcard and then with an audio editor programme, capture the sound...
Why are we waiting for the leak? Many of us are waiting for the new stuff and looking forward to listen to it as soon as we can. Release dates are a commercial thing, if we have the chance to listen to it before, many of us will do, and then, the commercial established date, we will buy it.