Ubisoft has detailed the upcoming Assassin's Creed II downloadable content packs it announced just recently.
The first, the Battle of Forli, is due out in January for $3.99 and features six new memories. It focuses on Ezio's work to protect the town of Forli from the invading Orsi family, and fleshes out Caterina Sforza, who you encountered briefly in the main game just before you went off to Florence.
The second pack, the Bonfire of the Vanities, is due out for $4.99 in January, and unlocks a new area of Florence. Ezio has to liberate the city from Savonarola, who has taken it over thanks to an Apple of Eden.
Apparently there's a new move in the latter pack - the spring jump - while video of the first add-on suggests that you get to fly around in Leonardo's whopping bat gizmo again, in between hauling people into hay bales and so forth.
Both add-ons will correspond to the missing "Sequence" numbers in the Assassin's Creed II Animus timeline.