Going to ask what has probably been asked a million times, but since this is a new thread I suppose we might as well use it as a primer for other new people joining in as well:
OG Timeline: Barry was supposed to get struck by lightning later on in life.
Canon Timeline: Reverse Flash intervened and changed the past causing Barry to receive his Flash powers earlier and his mother to die.
New timeline: Barry stops Reverse Flash from killing his mom and all the other residual effects.
Shouldn't the Flashpoint timeline be the original timeline then?
It would be close, but Reverse Flash is there to mess up these elements. We haven't seen Wells in these previews, so Reverse might have done something that impacts the explosion from ever happening.