
As I mentioned in this article Sony announced at CES 2013 the near future availability of a 4K player and a 4K content distribution service, expected by mid 2013.
People that have a 4K display today will have to wait for 4K content to arrive in some form to show the potential of their 4K panel/projector, or use the TimeScapes nature video and suitable computer equipment (such as RAID hard drives and 4K video cards).
There are currently two Sony 4K servers that are used for demos, and neither is available for sale.
One is used to demo the Sony 4K projector on industry shows such as CES, and the other is a more consumer friendly server that Sony lends to the owners of the recently released Sony 4K panels (84″ LCDs, $25,000 MSRP).