Preview the latest +1 button changes

[Google publisher buttons announce]

Want to test the latest +1 features? Today we’re introducing a new
option for webmasters who want to be the first to know about changes
to the +1 button. Enroll in the Google+ Platform Preview, available
globally, to test updates before they launch to all users on your
site. When you’re logged into the account you’ve enrolled with and
you visit a page with the +1 button, you’ll see the latest preview
release.

If you join now, you’ll be able to test the first set of updates we’ve
released to Platform Preview: hover and confirmation bubbles that will
give your site’s users an extra reminder of the account they’re using
to +1, as well as the fact that their +1 is public.

Enroll in the Google+ Platform Preview
http://www.google.com/+/learnmore/platform-preview/

Official blog post:
http://googlewebmastercentral.blogspot.com/2011/07/preview-latest-1-button-changes.html

The Google+ project developer team