Everyone's been speculating at what point the upcoming Deathly Hallows will be split. Joshua Herdman was kind enough to enlighten fans at the recent Muggle Mayhem. He told fans that the split was due just after the trio are captured by the Snatchers, and right before they are taken to Malfoy Manor.
Of course keep in mind that as filming is still taking place, and with this industry, things are always changing. So nothing's set in stone. But it's nice to know in the meantime.;)