Basically, all of this confusion sounds like the chatter surrounding HDTV about 10 years ago....
What it all means is anyones guess, but I won't be an early adopter this time. I went HD in 2005, and although I am glad that I did, it may still have been early.
I like the progression of tech, and I look forward to 4K and 8K in the home one day, as I may be one of the lucky ones with a Man Cave, so the wife doesn't care about the size of the TV.
However, the confusion, cost, and mystery surrounding content delivery will make the adoption of 4K very slow I think.
The prices will drop soon, but the bandwidth issue is a long way to being solved. I personally don't like compression, even though I am forced to deal with it, (DirecTV MPEG 4, iTunes, etc). It seems that most others don't seem to care and don't notice the difference.
UltraHD, or 4K? Neither will matter much in the consumer world for at least the next 5-8 years. For those of you who move forward within the next 2 years, good luck, as I'm rooting for you.