The next big story to happen to The Flash coming in 2018 will be an event called "Flash War", pitting Barry Allen against the original Wally West. This was announced at New York Comic Con's DC Metal & New Age of Heroes panel where writer Joshua Wiliamson took a vote with the crowd on which was the better Flash and it came out fairly even.
"Let's see who's the best Flash: is it Barry, or is it Wally?" said Williamson, teasing that the "Flash War" storyline will find out.
"It's me and Howard Porter starting in Flash #46," Williamson told the audience. "In January, we have an annual coming out that's a prelude to 'Flash War,' but starting in Flash 46, we go into 'Flash War.'"
It will be an interesting event to come for the two Flash's that comes to us January 2018.