Hm, I have no idea. I only read DH once because I was so put off by the ending. And it came out right when I was about to leave for my freshman year of college, and I've unfortunately lost the free time to read or re-read for pleasure. I don't remember any parts of the book that were 'cliffhangers' but I read it in all of two or three very long sittings, so I never had to wait to find out what was going to happen. All I know is I'm not a big fan of the split in general. I get that its a long, heavy book to do and they want to please all the fans by keeping as much from the book as possible, but I just wish they could do one really long movie rather than two.
In any case, I'm glad they're starting to talk about it right away. This wait for HBP feels like forever, and I'm hoping that the next two movies come out quickly, especially if they insist on ending at a cliffhanger. That'll be torture.