We've added an enhancement to the repository view for a branch that is different than its upstream branch. Previously we showed the number of commits the branch was ahead or behind the upstream, but there wasn't an easy way to show the differences. Now you can click a link that takes you to a comparison page to see the differences.
Note: there is a different link for
aheadrepresents changes your branch has but the upstream branch does not
behindrepresents changes the upstream branch has but your branch does not