Olympics may be available in very-high-def video.

[Query]

A company called Elemental will be involved.

http://www.dbstalk.com/topic/209409-elemental-gears-for-4k-olympics-and-ultra-hd-programming-tiers/?hl=%2Bolympics

I don't know anything else.

4K resolution is a fair bit more than HD.

[Query]

By the way, the higher resolution mode is called "Ultra HD TV".

You won't see the improvement if your display device is on a 720 or 1080 line HDTV.