Not really. Now you need to charge the Macbook with MagSafe and connect the dock to it. It's still two cables. USB-C allows you to charge your mac through the same cord it transfers data to/from.

Not like it matters too much, but I see some point in it — I come to my desk, plug in only one cable from the dock and have it all set. Also I can easily see how demoing it from the stage falls under what Tim Cook calls "innovation" nowadays. Which seems to become more and more important to him.