we know that it has samsung screen, for touch pad is used quantum-s (
QProx(tm) Touch Control and Sensor ICs | Quantum Research Group) QSlide QT411(this chip is the only reason I bought meizu M6) which uses standard SPI communication protocol(which is easy to use), we know that it is using separated audio chip, so all we need to know is which microprocessor is in (my guess is ARM(7-9)core or some of the Atmel's [since atmel owns quantum it would be possible]+connecting it to USB is veeeeery simple) and what type of audio processing chip.
when we get the display's, touch sezor's, processor and audio chip's datasheet's together, were almost there. So if someone there has opened their miniplayer already please post the marks of the components used in it(also the full display version)
last step is to measure on which IO pins is what connected (basic shematic)
when we get all this data, the firmware can be written from scratch,
so there's possibility to made UI look more "deluxe" and an album art, or even flash support.