Basically, what we know about Earth-2 so far is that it has its own (multi-generational) version of the Trinity, it’s home to Alan Scott, Jay Garrick and probably Ted Grant, and at some point Darkseid invades. This does not mean that everyone who first appeared during the Golden Age still did. Indeed, we can suppose that, because the New-52 Huntress is apparently in her early 30s (at most, I’m guessing), that would make her parents at least 50-ish and probably closer to 60 or even 70. Thus, the Earth-2 Bruce Wayne and Selina Kyle could have become Batman and Catwoman anywhere from the mid-1960s to the early 1980s. It’s a significant change from the original Earth-Two, where Helena Wayne was born in the early 1950s and became the Huntress in the late ’70s.