The Galaxy Nexus supports WiFi Direct. I've seen WiFi Direct to HDMI devices, so maybe that's how the HDMI dock connects to the phone for video? I think we'll have to wait to find out. It would be silly to dock the phone on its side for power, but then have to plug in a cable to the micro USB port for video.
The dock where you put the phone on its side is just a charging dock, like for a nightstand. The HDMI dock sits the phone upright and connects to the micro USB port. The HDMI dock has two ports on it, one for micro USB and one is a full (or mini) HDMI.
What I'm wondering, after seeing that dock and the adapter in the video you linked, is what these adapters are adding to the mix that isn't on the phone already. It looks like both the adapter and the dock essentially get two micro USB inputs, then output to HDMI. So I'm wondering if that second micro USB input is necessary at all...
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