>> Hopefully the docking station provides additional CPU/GPU power, otherwise this would be no different to a PS Vita.

Only if you make game console purchasing decisions based on hardware alone.

I would think that the hardware matters less if your primary interest is in having access to the latest and greatest Nintendo first party games like Zelda, Mario Kart, etc.

Since at multiple times the video shows you can walk away with the console with the game still running, I don't think the dock will do anything more than charging/HDMI