Upscaling from SkyHD is pretty good (yes there are a few channels which are quite low bitrate) if I do say myself and does it better than a recent Onkyo AMP I have which also does 4K upscaling. Compared to my recent TV (52" LA52A620) Samsung its a much better picture.
It has HDMI 1.4 at the moment and software upgradable to HDMI 2.0 by the end of the year. The 4K Samsung upgrade from 1.4->2.0 will mean a hardware upgrade box thingy which will cost more $$ .
HDMI 1.4 works perfectly well for Movies at the moment (I have Timescapes 4K movie (www.timescapes.org) and its pretty impressive + lots of 4K content off youtube playing from a Computer. HDMI 2.0 will be needed if you want to play games on it over 30fps.
It does not come by default with a Camera and it can be added if you want to use Skype.
In the future 4K content will come across as H265 which gives better compression than the existing h264 at the moment and reduce bandwidth needed by about 40% in comparison.
Displayport in the past was the only want to get over 30fps to the TV but with HDMI 2.0 this changes lots of things. There are a number of 4K monitors around and computers see them a 2 * Monitors which the graphics cards can add together (as the existing chipsets for Displayport cannot handle the bandwidth for single 4K display). AMD and Nvidia drivers can now run these types of monitors ok ish but my TV via HDMI just sees it as a normal 4K TV so had no problems via HDMI.
But yes finally yes there is no real content except for the stuff above. The PS4 (and Xbox one I believe) can do HDMI 4K output on them when they come out and there are rumours Sony will release their 4K Media Service on it (if it comes to NZ it is unknown) instead of having to have the Sony 4K Media Box (not available outside the US)