Hendrik,
I am one of those who had registered MC ( Linux), but had not even installed it yet. I have already built a Linux server with 40TB storage, 24 gig of memory, dual Nvidia gtx 9800 x2 gpus, waiting for the update to the video play back. Just today, I decided to clean up all my work areas to get the Linux box fired up sometime this week. The box has been built since 02/2014, I feel no need to crank it up, because all I am interested in is the Video part of the Linux MC, plus theater view. I already have it on MC for Windows with more than 600 + mkv blu ray rips, why worrying to set up Linux when no blu ray, and video support is limited.
In April, I wrote to ask about the state of video playback in the Linux platform, I got no reply.
I will try to at least install the Ubuntu OS soon, maybe MC 21 (Linux) will bring good luck.
Please at your convenience, let us know where we are at this time.
Thanks.
George Omoregie