During New York Comic Con, a five-part story was revealed called “Flash War”. In it, current Flash Barry Allen, and current Kid Flash Wally West are set to battle to see who will be called the true “Fastest Man Alive”. The story arc will begin in Flash Annual #1, and the synopsis for said issue has been released online, and it reveals certain things that’ll lean into the war actually happening, you can check it out below:
““FLASH WAR” prelude! The biggest Flash story of 2018 starts here, with a special story starring the classic Wally West, who’s conflicted over whether to let Iris West know he is alive—and he’ll need the help of the Flash to figure out what to do! But when Magenta, Wally’s old love, needs his help, the Flash returns home to Keystone City where he is confronted with violent memories of an unknown world… A major turning point for the Flash family that sets the path for earth shattering stories in 2018!”
The fact that they’re calling for “earth-shattering” stories seems to play up the conflict, and may indicate that a change of the guard COULD happen, but then again, solicitations haven’t always been accurate as fans know.