I have asked several times, and I did get a vague reply about six months ago. There's nothing in the pipeline I'm afraid. It is very odd the silence surrounding this issue, but whatever the thinking behind the apparent lack of progress, there are many 4k products out there that have filled the void.
I got fed up of waiting, so I got the Zappiti One, and I'm glad I did. It's a far superior machine to the Mede8ers.