Somehow I made my phone talk it now says "Home Screen Edit Page Open" when I pinch to see all the pages and then "Workspace 1 of 5" when I select that page. If I turn off Light Flow it seems to stop but I can't figure out if this a Light Flow setting or phone setting to turn this feature off.
It's a bug in Light Flow. Have you updated to the new version and made sure it's set on S3 mode? I'm not sure if the new version fixes this or not.
It's also related to Touchwiz. Since I switched to Nova, I no longer have that happen. I think you can also disable Samsung Text to Speech to stop it...but you will lose some other functionality with that.