I have to agree with Kommander. Ive just taken mine to bits and CON1 does indeed look like the base for a usb connector or a daughter board, given the size of the connection pads.
Im going to try and work out the surrounding circuitry there and where I think the bluetooth should be. As for the battery, will be easy to change but im not sure how much bigger I can go, given the space available.
As for the wifi antenna, I have a few ideas that might not need an external one. Going to take it in to work today, have a tweak and take a few measurements. Time to get out the magnifier, hakko and meter methinks.....