As mentioned by @ExpatInJapan here, VentureCraft is coming up with a new Go-DAP that can be used for iDevices and for Desktop/Laptop PCs. Preliminary impressions are that it sounds the pretty much the same as the Go-DAP 4.0 for iPhone 4/4S. It's dropped the proprietary 4/4S jacket and is more like the HP-P1/CLAS type concept (i.e. separate, non-integrated design), but it's slimmer than the HP-P1. It can be used with any current iDevice like the HP-P1, but the added functionality is that there's a switch which will allow it to be used as a PC Desktop/Laptop/Notebook USB DAC too. I believe this is the first such device I'm aware of anyway (not including the patch work of USB DAC+powered up+CCK to the iPad).
As the specs says :-
OpAmp is AD8066
Can be used as a transport with optical out
Comes with 2200mAh battery (like the upgraded Go-DAP 4.0) (5 hr charge, 7 hr discharge)
Made in Japan
W:67mm H:136.10mm D: 17.30mm 135g
PC DAC: Input 32/44.1/48kHz 16bit Output 32/44.1/48kHz 16bit
iPhone DAC: Input 32/44.1/48kHz 16bit Output 48kHz 16bit
HP Power output: 80mW+80mW (32ohm)
Dynamic Range: 90dB
Headphone Jack: Single Ended 3.5mm
Digital Output: 3.5mm Optical S/PDIF
Here are some pix of the prototype :-
































