I agree the dying leader is almost certainly Roslin, and the Opera House reference just about clinches it. She's been having those shared Opera House visions with CapSix and Sharon. The child, Hera, is in there to. From the previews, little Hera has been all snug in her bed with visions of Six's dancing in her head. I can only wonder if HeadSix has been visiting Hera....

Then there's the "children of the one reborn" who will find their own country line which I think is the one that refers to Baltar. The Dylan Four could be "reborn", and even Sharon could be considered reborn. Chief and Sharon have (apparently, as there could be a crazy twist) hybrid children, so it could be that. However, I think it applies to Baltar and the reborn children are his followers and converts to the "new religion". However, I think the "reborn" is going to include some Cylons (the original seven ones) as well as humans. And apparently Roslin is getting on the new religion bandwagon as well.

I think there's going to be a split on the human side as well as the cylons. Both human and cylon will have to make a choice of which path to go. And one path will lead to salvation and the other to damnation/annihilation. And either way is not going to be pretty.

-Richard