What exactly should I expect on my 3rd interview as far as questions and what are my chances in getting hired

Hi,

So I had my first two interviews and after the second interview I signed background check forms and was scheduled a 3rd interview with the GM. Now what questions should I expect in the 3rd interview? what are my chances in getting hired if I signed the background check form in my second interview?? does the chance increases?? I am applying for the sales department, though it looks like I will work in the mobile consultant department. I have read that a 3rd interview means pretty much I got the job but I have also read that some people haven't been hired even after the 3rd interview.