Hopefully the correct forum as its media related 
http://www.engadgethd.com/2008/06/30/divx-7-to-officially-support-mkv/
"Like anyone else, we can't get enough video formats -- not -- but unlike H.264, DivX, XviD and MPEG-2 the latest rage is Matroska (aka MKV) is not a codec, but a container. It is the format which holds other formats, so you should be wondering, what's so special about it? It is special because it can hold new combinations of codecs and it is open for anyone to use. The most popular new feature is its ability to contain x.264 video, DTS audio, and at the same time subtitles in multiple languages, all in the same file. It is quickly becoming the replacement for AVI...."

http://www.engadgethd.com/2008/06/30/divx-7-to-officially-support-mkv/
"Like anyone else, we can't get enough video formats -- not -- but unlike H.264, DivX, XviD and MPEG-2 the latest rage is Matroska (aka MKV) is not a codec, but a container. It is the format which holds other formats, so you should be wondering, what's so special about it? It is special because it can hold new combinations of codecs and it is open for anyone to use. The most popular new feature is its ability to contain x.264 video, DTS audio, and at the same time subtitles in multiple languages, all in the same file. It is quickly becoming the replacement for AVI...."
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