DH says Summit is looking at "high-end" directors to take on the final installment, which in all likelihood means that neither Chris Weitz (New Moon) or David Slade (Eclipse) will be returning to the franchise. So, they'll have to find someone who's not only down with being tortured by Twi-hards for the next several months, but also someone who has enough room (and mental stamina) to shoot back-to-back movies. I recommend Uwe Boll, but something tells me they want someone with a little more ... class? However, that someone will be tasked with adapting a monster of a final book, and one that veers off in directions that may not be so appropriate for the younger viewers. That director -- as well as Summit -- will also have to keep in mind that the final film will need to come out PG-13, so look for a few changes to take place during the adaptation.
For more on adapting Breaking Dawn and the potential for CG characters, check out Monika's post from last month. You down with two films? Who would you fans like to see direct the final Twilight movies?