I'm sorry but I'll jump in the hate-wagon too.
There is no practical use for this, not even for 4k as far as I can tell. With bandwidth being as scarce as it is right now it's hard enough to stream 1080p already and you want four times that? No you want 16 times that now!
This is exactly like the $1.200.- i7 or the $6.000.- video card setups. It's meant for a niche.
I don't like it.
PS: Are there cameras advanced enough that will be able to generate content for 8k resolutions? Are there portable storage solutions that will be able to handle them??
4K does have some uses, but mostly for enthusiast. Some games support 4K and having the benefit to use such a high resolution means disabling Anti Aliasing to get rid of the jagged edges without suffering from performance dips. Seeing that enabling AA is normally taxing on the GPU(s)
For cameras though, 8K isn't really new; or hard to achieve. 7680x4320 = 33177600 which is only 33.2 mega pixels, the Nokia Lumia 1020 snaps 41mp (38mp effective, which on a 16:9 aspect ratio is 8216x4624) with a price tag of about $350.00. Though typical DSLR prices can rocket into the thousands after hitting the 25mp mark.