Google+ Platform Preview - Become a Google+ Beta Tester
Would you like to preview the latest updates to the Google+ platform before they are launched to the general public? New features will be announced to you via email when they are enabled on your account. This preview will enable you to see how these pre-release updates will affect your site. Please note, using Google+ features across the web (such as the +1 button) will be affected, so please use an appropriate account.
Sounds good to me! If you join now, you’ll be able to test the first set of updates they roll out to Platform Preview: hover and confirmation bubbles.
If you hover your mouse over a +1 button, you’ll see a bubble letting you know what will happen when you click:
After you click, you’ll receive confirmation that the +1 has been applied:
So the first set of updates appear to targeting website operators who’ve rolled out the +1 button on their sites and want to be able to implement/test the latest change before it goes out to the general public.
Sign up for the Google+ Platform Preview.