Visual Studio 2015 Update 2 Team Explorer Missing 'Exclude'
Visual Studio now follows the Git terminology instead of the TFS source control Include/Exclude. In Git your changes are un-staged by default. From now on that's the case in VS too, and you can right click on the files you want to gather for the next commit and select "Stage". Once you staged some files, you can commit these staged files exclusively by Commit Staged button (the caption changes from Commit All after you stage at least one file).
As a shortcut however, when you want to commit every changed files at once - and all of them are unstaged initially - you can stage and commit them with one click with Commit All button.
First this surprised me. But knowing the Git terminology it totally make sense. Include/Exclude comes form the original TFS source control mechanisms, it served similar purpose, but it could have been confusing for those who where new to VS but knew Git.