Here's what Jackson had to say via Facebook:
"Back on set for our last Hobbit pick ups. Our last ever Tolkien pick ups, in fact. It’s going to be an intense few weeks, but we’re looking forward to shooting some powerful scenes with our great cast. Our next blog is coming soon!"
We know that the pick ups will last ~10 weeks and seeing as though this is definitely Jackson's last trip to Middle-earth (unless he can sink his claws and legal rights into THE SIMILARION as sort of the book ends to everything), so it's going to be a somber affair yet again with his team.
THE HOBBIT: THE DESOLATION OF SMAUG releases on December 13th, plus we can also look forward to the conclusion, THE HOBBIT: THERE AND BACK AGAIN on December 17, 2014.