Okay haven't fully read it yet but I was skimming thru it today and well Jason Todd rips out of his Red Hood outfit to reveal what looks like the Earth 2 Robin outfit? Honestly dunno if a spoiler but could explain somethings, he rambles on about his death and stuff but yeah that outfit makes me wonder.
It has some similarities, but it's not exactly the same as Earth-2 Robin's. The tights are close, but the shirt is all wrong.
I figure it was just another grown up Robin costume. If there are any similarities between it and Earth 2's it was because they're both that, and maybe a little fan-wank. But hot damn I LOVED this issue. I liked Todd as the Red Hood already, but seeing him wearing the Robin costume underneath it!? I imagine he's always wearing it too. He's bat-shit insane, and I fucking love it.
It was cool to see Jason in the Robin suit again. Although I felt sorry for Tim though. He got his ass handed to him.