I am on RPi2 and LE 9 RC2 and it works 1 out of 5 times or less.
Sometimes it works, then having only a Background Pic, then it doesn't start at all.
Very buggy the whole thing.
Mostly having errors like
CDVDInputStreamBluray - unhandled libbluray event 33 [param 3]
CDVDInputStreamBluray - unhandled libbluray event 32 [param 0]
those 2 are no problem, they appear also on Windows
OpenDemuxStream - Error creating demuxer
GetDirectory - Error getting udf://...http://bla.iso/BDMV/JAR/01001/OSM_GER_Composite1.png
often Java fails showing a first popup menu for language selection. only showing the background pic.
It works better if I don't choose 'show bluray menus' in the settings but in the simple menu after starting the movie. Might be a problem with the mounting, that takes ages in the RPi2.