I met up with my VentureCraft friend today again and this time to check out the Samsung Galaxy S3 hooked up to the Go-DAP X. What's interesting is that the Go-DAP X was working perfectly well with Android 4.0.4, no Jelly Bean 4.1 required (although it did work with JB 4.1 too).
VentureCraft mentioned that unlike PC USB (host?) mode, the Go-DAP X doesn't draw power from the phone. The recommendation was to put the Samsung music app at full volume, then control the volume via the Go-DAP X instead. There was only 1 track that I listened too off the Samsung but it did sound pretty good (off VentureCraft's AKG 701, and my UM SE530x8 Snoopys). This was a stock Go-DAP X with BurrBrown's OPA2134.
Note that this works with the Samsung Galaxy S3 Android 4.0.4 and 4.1 for now, but doesn't work (reliably) with Sony's Xperia models with Android 4.0.4. However it looks like when JB 4.1 is released by al service providers, we may have a very 1st device that's supported on both iDevice and Android platforms without any jailbreaks, root, hacks, tricks, or workarounds.
Some pix of the Samsung with Go-DAP X. Note the Android version 4.0.4, and the USB connected and disconnected whenever I switched the Go-DAP X on and off. Also last pix of the Go-DAP X with the Apple Lightning cable :-