You can see how Google will view your site using the Rich Snippets Tool here: http://www.google.com/webmasters/tools/richsnippets
Google is pushing for WebSchemas as the standard mechanism for embedding metadata on the Web, however, Google+ can fallback to OpenGraph if that's what's available. Incidentally, when I take your snippet above and drop it into our tool, I get the correct output.
More likely what you're seeing is an element of the recent site redesign, where our snippets no longer display the Description. I am not entirely sure why that decision was made, but it is by design.