In the past few weeks the Chicago White Sox, the Washington Nationals and the Pittsburgh Pirates have all announced plans to extend protective netting at their respective stadiums. Currently, there are no MLB ballparks that have protective netting to the foul poles in the outfield corners. The changes are expected to be made as soon as possible this season. 

The White Sox have plans to extend the netting all the way down the foul lines to the foul poles at Guaranteed Rate Field. 

Unlike the White Sox, the Nationals announced that the netting at Nationals Park will not extend all the way to the foul poles. This image shows where the netting will added: