, mplayer2? ... ooo, looks interesting. The killer that stops it replacing mplayer for me is, of course, the lack of mencoder... rotten or not, I have a lot of scripts that use it :) but the better mkv support looks nice, actual chapter handling no less.
However, it's a video
player, really -- mplayer's user interface is thoroughly unpleasant for audio playback, and as far as I can see mplayer2 has even less
of a user interface than mplayer did. (And it doesn't play everything. Try asking it to play ScreamTracker Pro modules. MPD can. Hell, it can play SID chiptunes!)