Episode 5 is called "Blood Calls Blood," which is from the Dark Prophecy in TGH! This would match up with 2 books a season if the season is 8 episodes or so. Though I'm not sure how they get through TEotW in 4 episodes.
I think they're legit getting ready to start filming, if they're not already :eek Rafe Judkins tweeted today that Daniel Henney was "who I saw in my mind from the first moment I started writing, so to have him here in Prague is surreal"--as in, present tense :eek
Yeah, I was hoping for a cast member every week too! Especially since I think they're supposed to start production in the Fall? There's a lot of characters to cast :lol Maybe we'll get a bunch at once.