That depends: Are we saying the Colts would join the division as the fifth team? Or would we replace someone else?
For the former, I could see us basically splitting with everyone besides Chicago (we would win both games). So that would put us at 5-3 for the division. However, if we were to clean up a lot of mistakes, and the defense improves more than expected, there's a chance we could win both games for each team with the exception of Green Bay. So either 5-3 or 7-1.
This is only if we came on as a fifth team of course.