First set of Bing's webmaster guidelines have been posted here:
Webmaster Guidelines - Bing Webmaster Tools

More of a high level document than Google's (aka geared to the business owner and not necessarily at the web master level).

For those details the BING FAQ has more relevant details:

No word yet on less-than-fluent quality raters being hired for manual reviews of sites like a search engine we shall not name....