How is it going to change the DC Universe?
DC Rebirth is ongoing superhero comics book relaunched in 2016 by DC comics. It is supposed to restore the DC Universe from previous story line. It is said that many characters will re appear in the story line. Issue 1 is out and running. I myself haven't read it. This might be useful : http://dc.wikia.com/wiki/DC_Rebirth
(But in the end link is spoiler)
I want to know all the Flash (as Speedsters) characters in DC comic till now