The trailer shows Barry Allen and Kid Flash meeting for the first time with Barry in civilian dress, which could possibly point to the confirmed plot point that Barry will begin to forget his powers in the new season.
Fans are still eager to learn how The Flash and Kid Flash end up uniting, especially since Iris doesn’t even know Barry any more in the Flashpoint universe.
When The Flash introduced character Wally West (played by Keiynan Lonsdale) in season 2, comic fans immediately recognized him as the alter ego of Kid Flash.
Images from season 3 finally gave us an answer: Barry’s time-space manipulation has resulted in an alternate universe starring Kid Flash.