@RossPubGrp Dash lets you use your speed again. It doesn't increase your speed.
— Jeremy Crawford (@JeremyECrawford) April 4, 2015
@RossPubGrphow does dash work with jumping? Also, flying, climbing, swimming, etc.? The movement granted by the Dash action follows the normal rules for movement, including jumping, climbing, etc.
— Jeremy Crawford (@JeremyECrawford) April 10, 2015