How do I preprocess_html() a panelized page? My intentions is to take a panelized page and use fields provided in that page to create class names on the body element. 

When I preprocess the page, I don't get the original node information and can't pull the information I need. 

My panelized page has 1 pane that has the node-> content pane in there.

If I could just get the NID of the current page, then it would be okay. But that doesn't even show up in the variables in the theme_preprocess_html() when a page has been panelized.
Solution was to use menu_get_object(). Here is a nice article outline usages of it as well.

$node = menu_get_object('node');


Thanks you David for the answer.