Had to take a look
The serial header is 2.54mm but if you want to make use of it you'll have to solder so that the pins lie flush with the PCB and don't protrude at all.
Disassembly is straightforward. Once the snap-on quilted cover is removed a thin plastic cover protects the PCB - six tiny philips screws have to be removed to remove that and access the board.
Points of interest:
1000mAH battery
Samsung K4X2G323PB-8GC3 256MB RAM
Freescale i.MX507 CPU
neonode NN1001 single chip touchscreen controller
CyberTAN WC121 network controller
TI 430G2333 (low power processor... hall effect?)
TI TPS65185 EPD power supply
(TPS report here)
Serial port 3.3V (marked 'V') is unpowered when the device is shut down.
Larger images in zip.