Earlier quoted context omitted.
I'm not sure what you're talking about. When I start typing into the "to" field in Gmail, it drops down with people matching the name or email address that I'm typing in. I can then choose from that list auto-complete that address. This is just going to add in the ability to do this with your G+ contacts as well.
I was terribly wrong, sorry for that!
No worries, we're all mistaken about something on the internet at some point in our lives. Have a great day!