The actor who plays Goyle in the Harry Potter films, Joshua Herdman; spilled some news about the last 2 Harry Potter movies. He says that the first part of the Deathly Hallows will end right after Harry, Ron, and Hermione get caught by the snatchers after just being reunited with Ron. The second part is supposed to start off with them inside Malfoy Manor. The seems like a really good breaking point to me. It will be really suspenseful for the people who have no clue what's going on.
I must reiterate the fact that Dobby needs to be in this movie though. If not, then Harry and the whole gang shouldn't be able to escape from the Malfoy's. I really don't understand why they cut him from the 4th movie and had Neville give Harry the gillyweed instead. Were they really just being so lazy because they didn't want to c.g. another character into the movie? Also, Bill and Fleur need to get married because otherwise Harry and the rest of them will have no where to go to hide. But, I'm not really sure where they will have the wedding seeing as how the Weasley's house got burned down in the last movie. I'm interested to see how David Yates is going to fix what he screwed up.
Another thing that is interesting about the last 2 Harry Potter movies is going to be the lack of Crabbe, since his actor Jamie Waylett got arrested for possession of marijuana. This means that Crabbe will either be completely replaced by a different actor (which I highly doubt since they decided not to change anyone out for the last movies, despite their ages) or that Goyle will take his place in the room of requirement. I suppose they could just fill in with some random other Slytherin boy like how they replaced the Creevey brothers with that random Nigel kid.