Well "support" for mplayer is overrated. It is very unlikely that you can buy a new bd and play it directly using libbluray. What matters is m2ts support - and there subtitles are still missing for mplayer. vlc 1.1/git or xbmc can show em. But its really nice to see that x264 can be used to create m2ts, as some bd titles with h264 used very bad encoders, most vc1 encoded titles looked better. also bluray menu support is something that need to be implemented - for those movies which are not just in the biggest file on the disk.