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Despite the healthy adoption rate by webmasters so far, implementing the rich snippets markup correctly can still be a major challenge. To help address this, we’ve added new error messages to the rich snippets testing tool [google.com] to help you better identify and fix any problems with the markup...
We are now adding support for a Breadcrumbs [google.com] markup format that allows webmasters to explicitly identify the breadcrumb hierarchy on their pages.
I still need to figure out what exactly they're saying, what's new, what's revised and what's old news. But it looks like Google wants to give more sites a shot at rich snippets and breadcrumbs in the SERPs. So the experiment must be testing well.