An Earth 2 Picture is worth a thousand words.
Look at the picture posted in the announcement and you will see something interesting things.
Here are my observations:
1. A black Superman. This means that Val Zod ( introduced in the current storyline) becomes the new Superman.
2. Doctor Fate's Helmet is on the ground. That one is a no brainer because the article says that the helmet will be a part of the story.
3. Green Lantern's ring is flying off his hand.
4. Huntress lifeless in her Grandfather's arms.
5. An exploding planet that doesn't really look like Earth, but we do have Future's Ends storyline that another Earth will be at war with Earth 1 in the future..Could it be Earth 2?
That is all I have on this for now.
Go Forth and Do Well,