It's Geoff Johns. Naturally he went back and read the entire history of the character and is now writing it to "come true". I'm not saying that's a failing, mind you. However, it's not surprising that something Geoff Johns writes ties into previous DC history. In fact, it's to be expected...
The cool thing is that, this time, you don't need to be aware of the original issue to enjoy the current story. Johns doesn't rub the reference in your face, like he's done in the past. Until I stumbled upon this, I thought he'd just made up the prophecy and put it in the Book of OA. And it'd work just the same if that was the case, too.
Also, I like the idea of the "Ultimate GL" not being someone from Earth. Typical attempt on Moore's part to get rid of improbable coincidences (like naming the Marvel U Earth 616, instead of Earth 1 or 2 like in DC). Hopefully the character won't turn to shit before the story is over.
