The Verge interviewed the little known Netflix Chief Product Officer Neil Hunt. The interview broached numerous different topics, though most interesting takeaway was that Netflix expects to be streaming 4K content within one to two years. I'm still not convinced that streaming 4K will be easy to do within two years.
Netflix CPO Hunt:
Clearly we have much work to do with the compression and decode capability, but we expect to be delivering 4K within a year or two with at least some movies and then over time become an important source of 4K. 4K will likely be streamed first before it goes anywhere else.
He adds that they filmed House of Cards in 4K. Currently it's only available in full HD, but he says that the raw footage is actually 4K quality. "We hope to have some House of Cards 4K encodes later this year." You can read the full interview, which covers which clouds Netflix has looked at and many more topics, at the source linked below.