My God, this is a powerful feature...
I just ran a KRpano tour in a KRpano virtual museum setup.. Panoception! Everything just works, even gyro devices and smooth too, even on an old iPad.
I added the iframe hotspot options to my custom tour editor suite and the possibilities have just shot up exponentially! Just imagine the possibilities with html/javascript interfaces that are part of the pano.
This is hot stuff!