The spoilers have been out for a couple days now but if you just picked it up today you know that in DC Rebirth they mentioned that in WW2 the JSA did exist as a hero team but that the world forgot all about them. The only member we saw though was an old Johnny Thunder who has been put in a mental hospital who's been trying to find the members of JSA as well as trying to get his genie back.
With this in mind I thought I'd try for a discussion on the JSA in the Rebirth line. Personally I think we are going to see something similar to Geoff Johns run where the JSA recruit younger heroes who are related to current or past members, I think this because if they really did fight in WWII then the members are getting up there in age unless their power can slow down their age. Not to mention they did mention Johnny Thunder's grandson as the only one who believes him so it wouldn't be a huge stretch to use him. That's just my thoughts though, what does everyone else think will happen with the JSA in Rebirth.