Pinterest have been rolling out a few changes today. There's a little blog about it on their site.
I like it - they seem to be moving past that 'slightly less shadow, slightly squarer, slightly more white boxes on grey' thing that's happening a lot right now. Even the barry horns are getting involved.
Anyway - one of their changes is to how boards are displayed.
I wonder if this will change pinning behaviour - now that your latest pin will be your board's thumbnail - will each pin need to have more meaning?