I, however think that there might be something to this html 5 thing and would like to include it in my tool chest for when a client requests it (as it already has).
I agree that there is 'something to this HTML5 thing' but as far as I know (am I mistaken?) it is nowhere near being deliverable for virtual tours in a manner that can compete with what we can do using Flash today - so I don't think you need be too concerned about someone else is taking your clients' business away from you just because you can't yet deliver the 'HTML 5 solution'.
I asked why your client requested it; I would like to learn why they wanted an HTML5 solution rather than Flash. Perhaps you didn't ask?
As I understand it Klaus' krpano for iPhone, iPad and iPod touch cannot yet even handle hotspots to link panos into tours:http://krpano.com/iphone/
And the resolution that iPhone and iPad can display is not too exciting:
"Only cubical panoramic images are supported at the moment!
And their size is limited (the exact size is unknown), for the iPhone cube face sizes like 480x480 to 640x640 seems to be good, and for the iPad something around 1024x1024 to 1280x1280. Just play around and find what size is good in your eyes.
BUT NOTE - too large images will crash the Mobile Safari Browser!"
There's been some discussion of HTML5 Vs Flash on the panoguide forum - you may like to see what others have had to say, for example:http://www.panoguide.com/forums/qna/7841/http://www.panoguide.com/forums/qna/7784/