I won't. Not until it supports mkv
The problem is, MKV is a container format.
So supporting MVK, in a general sense, means implementing many, many codecs or at least allowing 3rd parties to implement these codecs.
It ALSO means providing the hardware to run these codecs effectively for common video sources.
That's where this idea breaks down. ATV is probably going to need to be expensive (not to mention bigger) to contain the hardware to run the codecs people might want to use with their mkvs and will either have to write (or port) and support a lot of codecs or open the system to let 3rd parties supply those codecs. I can't see Apple doing either of these.
Edit: more likely, is that various 3rd-party apps will provide partial mkv support, based on codecs already included with ATV.
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