Email is more than just messages going back and forth -- it's also about
the people sending them. That's why today we're introducing changes
that continue to bring people front and center in Gmail, just as we did
with
profile photos in conversation view, the
people widget and
last year's integrations with Google+.
Today’s changes include quick access to contact details when viewing
past conversations as well as improved integration with Google+ circles.
Quick access to contact details
When you search for an email address, the search results will now show
you contact details in addition to that person's profile photo and the
emails sent from and to them. From here, you can start a chat, call
their phone and more. Plus, if your contacts have a Google+ profile,
this information will stay up to date automatically.

You can get to these same results in a variety of ways including from the people widget, contacts and the chat list search menu.
Improved circle integration and circle search
In addition to adding contact details to search results, we've made some improvements to the
circles integration
announced in December. When you select a circle, you'll now see
profile photos of people in that circle at the top right of the page.
Plus, when you click on these images you'll be taken directly to search
results with contact details.

Circles are also now supported in search and filters. Find messages from a specific circle by typing
circle:[circle name] in the search box. You can also find mail from any of your circled contacts by searching with
has:circle.
You can refine your search even further with other criteria and create
filters based on circles. This means you can now view all the unread
emails from your ‘Friends’ circle or automatically star every message
that comes from your ‘VIP’ circle.

These updates are helping us to provide a more consistent, beautiful
experience across all of our products. Quick access to contact details
will be rolling out to everyone today. To take advantage of circles and
more in Gmail, you'll need to
join Google+.