netmeg - 5:51 pm on Mar 26, 2013 (gmt 0)
It'll pre-populate if you're logged into a Google account. I use these all the time (AdWords for my clients) but I had to write and get permission; not sure if it's rolled out everywhere yet. But we've been doing for newsletter signups for about a year.
You don't need to opt out; nothing gets sent unless you click the submit button (Get Offers) on the ad.