It looks like NBC will be providing a 4k feed this year. I am super excited to see Atmos involved, and would like to see this be added to Cinema 4k PPV with the 7.1 surround we already get.
http://www.broadcastingcable.com/news/technology/nbc-announces-4k-plans-rio-olympics/156867
In a potential first for a major sporting event, NBC Olympics also announced it would make the opening ceremonies available for distributors in high dynamic range (HDR) and Dolby Atmos, the next-gen, object-based sound technology.
http://www.broadcastingcable.com/news/technology/nbc-announces-4k-plans-rio-olympics/156867