I couldn't really watch it, unfortunately, but the general feeling I saw on Twitter was that this was a vast improvement from last year's WWDC.
Gizomodo has a nice round up of the features announced. HomeKit sounds VERY interesting... it'll be fun to watch vendors try/not try to take advantage of that. And integrating Shazaam directly into Siri is pretty cool - but are people really hearing music that they don't recognize when they are out?
So it turns out there is more to this than the cabling, as I can't get the two power supplies (two different manufacturers as well) I purchased to even power on. Throw in the old one (which I believe is dying, hence the issue), and it powers right up.