Netflix has begun streaming video in 4K Ultra HD resolution in the UK, launching the service with House of Cards Season 2, but you'll need to have a new 4K TV with the required HEVC codec.
So that's good news if you shelled out as an early adopter for a 4K TV from LG, Samsung or Sony as they have the latest Netflix app, allowing them to stream 4K content, but there is no word yet on a new TiVo app.
Nor is there going to be masses of 4K content. A Netflix spokesman said "Initially, there will only be a few titles on Netflix available in Ultra HD. We will have House of Cards Season 2 as well as a few nature documentaries. We will add more titles over time, but it will be a slowly expanding offering."