Let me just first say that I love reliving the book through other peoples eyes. I re-read the series during season 1 and I really don't feel like reading anything else lol.
I am pretty much up for any opening, whether it's true to the books or not, but I think it would be a huge mistake if they don't close the season like this. Such a terrific cliffhanger that promises so much for a third season but doesn't leave you wondering if the characters you love are dead or not (yes, taking into account time travel and alternate time lines).