The new issue of Entertainment Weekly confirms that the splitting point between the two parts of "Harry Potter and the Deathly Hallows" will take place later in the book than expected reports Hollywood News.
-- SPOILERS AHEAD --
According to the mag, "Part I… will end at about Chapter 24 of the book, with Voldemort gaining possession of the Elder Wand". This comes later than expected as the book itself is 36 chapters long, making the cut off point at the end of the first film around the two-thirds mark of the story.
This would mean the second film opening next July would mostly consist of the Battle of Hogwarts, while the Gringotts break-in would likely kick off the film.