Version 3.3 firmware for the M0 was released yesterday. Interesting new functionality is the SyncLink capability and companion Android app (APK included in firmware download, it's not on the Android store yet)...
http://en.shanling.com/article-M0-V33.html
Note that you have to initiate a music update from the phone in order for the app to index the content on the M0. Once this is done, you can browse the tracks on your phone, but they are played from the M0. Also, the volume control on the phone will control the M0 volume whilst in the app. I can't see a way to get the M0 volume slider up without pressing the phone volume buttons.