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I helped assemble this, the guy you would want to ask is https://twitter.com/chrisbensen

The important thing to remember about USB cables is that you can cut them open and do whatever you want. If you can solder, you can hook up the power and ground to anything with 5V.

Not sure what they used.

In my tiny 4 Pi cluster I'm using a regular 1U server PSU. It supplies 5v and can easily supply the current needed for the four Pis.

The power supply in picture seems to be labeled WANLONGXIN, which Google says is a manufacturer apparently.