From what I can guess :
LI-Po battery, 2000mAh 3.7V, given for 16 hours of run time with 16bits/44.1kHz FLAC. Battery doesn't seem user serviceable, but the pics show screws, so it should be possible to open it fairly easily.
Dimensions and weight 59.2mm X 79mm X 14.4mm, 122g.
2.4" IPS screen
The overall design is very close to the H1X0/H3X0 series.