There's a screenshot circulating, which is cropped above, that shows a new "beta version" of the infamous GearScore mod that is able to see your Real ID name -- that is, your real name -- just by mousing over your character. It's not real. We reported on a possible security loophole in addons that could, with enough black magic, reveal your Real ID name -- but this isn't what's happening here.
The creator of the image has admitted that the screenshot isn't real. You can officially cease linking it around and freaking out. We know that the idea your real names being on the forum might be scary, but it's important to keep a level head and not let fear take hold of your behavior, no matter what side of the issue you're on.
The important thing is that Blizzard knows how you feel. Post on the forums and let them know, cancel your account (or don't), and if you want to opt out of Real ID altogether, Robin Torres has assembled a guide on how to do just that.