I think a lot of BSNers are in for a lot of continued shocks, if this actually surprises people.
The Chantry as we knew it is over. We're dealing with its power vacuum and remnants and masses of believers, but the way it is going to work is open to drastic changes and new decrees.
"Change is coming to the world. Some fear change and will fight it with every fibre of their being. But sometimes, change is what they need most. Sometimes, change is what sets them free."
Andrastans need to be set free. And so do many fans, it would seem.
Anything can happen now. And it should. Thedas is a cesspool compared to what it may one day become.
This all being said, from what I understand so far, I'd support Vivienne or Cassandra. Leliana should just explore the world and its wonders some more, like I thought she should in DAO (and I guess she sorta gets to, in her own way, anyway).
I'm still not sure that we'll actually be able to pick the Divine, but I definitely think it is possible. Southern Thedas is being intentionally shook up by Bioware, and prepared for whatever next steps there will be of the larger story.