Thanks for this info. I don't know too much about what is out there. It looks like the PanoTourPro is 400 Euros and the Kolor LivePano plugin is 200 Euros.
I imagine that the Ricoh software does not have a nice user interface right now. I don't think they're selling it yet.
I looked online and see that the Pentax K-1 is $1,783 for the body only. My understanding from casual discussions with Ricoh staff is that the THETA doesn't need to be paired with this particular camera. It could theoretically work with a wide range of DSLR cameras.
An earlier video interview with Kohta Nagai reported that the software used both object recognition and position matching to align the images.