Superman and The Galaxy Trio

Superman has been off-world in the CW shows, raising his newborn son, but I figure they have to bring him back for next year's Crisis on Infinite Earths crossover.  The real question is whether they will do some version of the death of Supergirl in that event, which was one of the biggest moments in that original comic series.  Hmmm... there's also the death of The Flash in there... but maybe Green Arrow will be the big TV death since his show is going away.