I think the key to your question is that HTML 5 is still not finalized.
Yes, you can find people who can work in HTML 5. I bumped into this site while surfing:
http://emacsformacosx.com/
Its a beautiful example of html5. It has a copyright in it (if you do a view source). Perhaps you can track down the person who did it (it wasn't me).
You are welcome to drop me a private message. I do work for hire but I don't claim to be expert in HTML5 yet. I am currently writing a new application using HTML5.
You might want to ask a different question. You might want viewers to suggest questions to ask potential candidates about HTML5 so you can find someone who is a good fit.