The show-makers basically confirmed at the end of the season 2 when the Flash went back in time and saved his mother from the Reverse Flash, as a result disrupting the timeline. The Flashpoint Paradox animation movie adapted comic-book series Flashpoint created by Geoff Johns which remains a fan favorite. Grant Gustin revealed the title of the first episode of season 3 on his twitter handle – “Flashpoint”. He wrote “We are definitely doing this FP thing our own way. I have read Flashpoint, I have seen the amazing animated film. This will be its own thing.”
At the MegaCon panel, Carlos Valdes was asked about his opinion on whether Barry’s attempt to save his mother from the Reverse Flash would have an impact on the timeline. He said “All I’m going to tell you is things are going to be different, way different. Not in a bad way; I think in a really exciting way, and it’s that difference that’s going to inform Barry’s trajectory throughout the season, and I think people are going to like it. I think there’s every chance of a Flashpoint paradox.” Matt Letscher (Reverse Flash/Eobard Thawne) said in an interview “Barry is starting to get unfolded in this new timeline so he is losing memories of the previous timeline”.
According to credible sources, the impact of Flashpoint will be neutralized in the first episode itself, although there will be permanent ramifications. The 8th episode will feature a mega DC 4-night crossover among CW superhero shows. In an exclusive interview with EW, Andrew Kreisberg (executive producer) said this on the scope of the Flashpoint storyline “All of the stuff is at our disposal, we really want to do something personal to Barry, the stakes in DC Comics was global while in the TV show they are limited to Barry, his existence and the people that he loves.”
The season 3 of Flash will start from Oct 4, Tuesdays, 8:00 p.m. on the CW network.