Are they actually keeping Wally as Kid Flash? I kind of assumed he'd arrive in the costume, but not stay that way. He looks like an adult in the pic, probably the same age as Nightwing, Arsenal, etc.
As for the JSA, I'm assuming by "original" I think they mean something like Geoff Johns JSA. So, a legacy group with some of the old members still around, like Alan Scott, Wildcat and Jay Garrick, but with people like star Girl, Cyclone, etc as well. I don't think the spoilers meant that the JSA were like the Convergence issue where they were aged to "realistic" ages because of the dome or anything. So, yeah, some members would be dead of old age or retired, but while I love all of the pre-reboot JSA incarnations the Johns mixed generation JSA was always my favorite, so I hope that's what we get. I wouldn't be against some resurrections of dead members, though (like The Atom or Sandman). Regardless, I'm just glad to get some form of the old JSA back. It is basically guaranteed to be an improvement over the lame New 52 "Earth 2" characters.