Japan's public broadcaster NHK has begun the world's first regular TV satellite broadcasts in 8K resolution

The channel, titled "Super-Hi-Vision", was launched on August 1st and features both 4k and 8k content. 8k content has a resolution of 7680 x 4320 pixels - 16 times sharper than 1080p and four times sharper than 4k.

Because nobody currently owns the equipment necessary to tune in to the channel at home, NHK is installing viewing stations around the country for the public and is holding events designed to showcase footage from the Rio Olympics. NHK has a history of pioneering new viewing formats. Back in the '80s, they started broadcasting programs in HD decades before high definition television went mainstream - so don't take this as a sign that you'll need to upgrade soon.

Source: http://www.theverge.com/2016/8/2/12349954/8k-broadcasts-start-japan-nhk