This TV has 4096x2160 resolution which is known as "quad HD". There have been a handful of other TVs out there with this resolution but none have been mass produced for the market.
The highest resolution I've seen for a computer monitor is the IBM T221 which is a 22" LCD with a WQUXGA 3840x2400 resolution which made everything ridiculously small.
This TV will definitely cost upwards of $80,000 if I had to put a price tag on it.. because the other quad HD displays were in the $30-40k price ranges but weren't as big as this one. Good luck finding any video content that is actually that resolution

Maybe 10 years from now it will become the norm resolution for larger TV sets.