Time Travel and the Cosmic Treadmill Are Coming to 'The Flash'

The Flash star Grant Gustin has recently revealed that things are about to get even more complicated on the show, with time travel and the Cosmic Treadmill to be featured on the show soon. Looks to us like big things are coming for Barry Allen and his friends on The Flash. Have you been watching? If we indeed are getting time travel in the future of the show, what storylines does this open up?