As with most Google innovations, upgrades and optimizations are always being worked on. Google recently announced an opportunity to sign up to see and test upgrades to the +1 button.
Sign up with your Google account at the Google+ Platform Review and when you are logged into the account and visit a website utilizing the Google +1 button, you will be able to view and test the newest functionality of the +1 button.
I signed up and immediately noticed a new component of the +1 button. Hover and confirmation bubbles now appear to show the user what will happen if the click, what happened after they click, as well as other actions (other friends that have clicked the +1 button).
Google indicates that this will serve as a reminder as to which account the user the signed into as well as that their action will be made public. In addition, you can see which people in your Google+ circles have also used the +1 button.
Remind me to tell Eileen she has to add a photo to your Google+ account!