There was a little bit of discussion about this in the product page for book 1, but I wanted to see what other GMs have done or are going to be doing when starting the AP.
My players are finalizing their characters now and we'll be starting the campaign in a couple days. They know that they are friendly with Wrin (from the Player's Guide) but I'm not sure I want to jump straight into the Ruins.
That said, I'm considering something like a flashback: start off in the Ruins as suggested, then after a short while, go back to the party's last meeting with Wrin as she explains her concerns with the Gauntlight. My concern with this is (knowing my players) there will still be some "um, why are we here, what are we looking for" at the very beginning, and I'd rather not just TELL them out-of-game if I can help it.