What I perhaps didn't make clear is that I anticipate there being a Windows Store app for use on any Windows 8/8.1/Threshold machine (tablet, laptop, or desktop) and because it is available from the Windows Store, most people would also refer to it as a mobile app.
I would like to be able to use a Photosynth 2 app from the Windows Store on my desktop or laptop in the same way that I use the original Photosynth desktop application, insofar as:
1) I can drop any photos into it (they don't have to be captured with the Photosynth app),
2) I can queue up uploads which can upload all night, but which will focus on one synth at a time,
3) If the app detects that I'm operating off of a tablet, laptop, or desktop which is plugged into power instead of running on battery power, I can opt in to converting the images to deep zoom images on my own computer before upload in order to avoid duplicate uploads.