Ultraflix mentioned in this "reasons not to buy" 4K TV article today...

A few titles are available to stream or purchase from Amazon Instant Video, YouTube offers a wide variety of clips and other videos, and services like Playstation Video, Sony’s Ultra streaming service, M-GO, DirecTV, and Comcast Xfinity offer rental and purchase options if you have the right TV. Other apps to look into include UltraFlix and Vudu.

http://www.cheatsheet.com/technology/reasons-...?a=viewall