Since the New Golden Age #1 is establishing an updated version of the JSA’s history in the current DCU, I think it deserves its own thread so we can talk and speculate about it without needing spoiler tags.
So basically what the special established so far is:
* The JSA debuted in November 1940 and the initial line-up is the classic one (Alan Scott, Jay Garrick, All Pratt, Kent Nelson, Wesley Dodds, Spectre, Carter Hall, Rex Tyler and Johnny Thunder). No different additions at this point and the Trinity is nowhere to be seen.
* Sometime later Wonder Woman joined the team and was active for “decades” before the 70s. This might indicate that like that special from post-Infinite Frontier showed, she was the first hero to publicly debut but may have joined the team sometime later. In that special we saw her debut inspiring Alan Scott.
* 13 new (or revised) characters were retroactively inserted in the past during the Golden Age. They had all been removed from the timeline at some point in the 40s and the young ones, including a never before seen daughter of Jay Garrick, are still missing (Stargirl will presumably find them in her new mini). In 1976 Doctor Fate doesn’t seem to remember his former sidekick Salem.
* In 1951, the American government tries to get the old team (plus WW and Black Canary) to unmask. Originally, the team disbanded for a while after that.
* The JSA is still around in the 70s. It seems Johns is keeping aspects of their All Star Comics run, even though it was set in Earth-2 and featured a conflicting version of Helena Wayne.
* Kent Nelson (Doctor Fate), Charles McNider (MidNite), Power-Girl and Star-Spangled Kid (Sylvester Pembleton) are part of the 70s line-up.
* This cements Power Girl’s debut earlier than Superman’s, which is bound to be a continuity nightmare and may call for yet another retelling of her origin. It also makes her more than 60 years old in the present (but she only seems to have aged by the time the character appears in Huntress’s future.)
* In the present, Kent Nelson is still dead and Khalid is continuing as Doctor Fate.
* We see glimpses of Infinitors such as Jade and Obsidian in some of the Who’s Who files, but it’s not clear where exactly they fit in the timeline. I worry they will be made as old as PG now because they were all Infinity Inc. teammates.
* 18 years into the future, the now teenage daughter of Batman and Catwoman vows to become Huntress to get revenge on her father’s killer (presumably Per Degaton). This may indicate the new Huntress is younger than we thought.
* At the time if Bruce Wayne’s death, JSA members are old Power Girl, older Alan Scott, a Doctor Fate and a speedster that’s probably Judy Garrick.
* The legacy of the JSA lasts at least until the 31st century, but Per Degaton is trying to kill them all. The wannabe JSAers of the 31st century (a Doctor Fate, Atom and GL) are now dead.
Notably, no mentions of characters such as Black Canary, Shiera Hall (Hawkgirl), Wildcat etc so far.
Feel free to add details I missed and speculate on upcoming developments
I didn’t include the Watchmen sections because I want to keep this thread focused on JSA history.