I’ve just found this wordpress plugin from Alexander Tumanov which permits to visualize your hosted panos.

Let test it there for some still pictures of mines:

Well, it seems to do its job but no zoom on your view,
nor heading choice (while mine have xmp photosphere datas);

No problem in full screen ; but forget to put hotspots ;

Nevertheless it’s an « easy install » nice plugin for simple cases.

To compare with direct google services you can go on my google+ page :

FabKzo on Google +