Gotta agree with you guys, this game is amazing. I've managed to get all but two achievements, getting all the feathers and then wearing the cloak you get from getting all the feathers.
I really can't wait for the next game, it should be even better. I assume it would be set more in the present then the past this time, but I've also read that there thinking about having Desmond have an ancestor sometime during the middle ages and it would involve the legend of king arthur (maybe having Excalibur being another piece of eden) or maybe one from feudal japan.
the third comes out november of 2012 and these are the setting they have narrowed it down to
Assassin's Creed 3 may either see Desmond still in the Animus, or fully independent of the Animus and taking the fight against the Templars to the modern day. If the game continues in Desmond's genetic memories, there are many possible settings for AC3. Here are some possibilities.
World War II
Assassin's Creed 3 could be set in the Second World War. Ubisoft has already stated that they are looking into the possibilities of a World War II setting and having an female Assassin as the main character. Further leading to the idea is that according to Subject 16, both Adolf Hitler and Joseph Stalin were confirmed to be Templars. Franklin Roosevelt was also seen holding the Apple and Altair mentioned in his Codex a vision of the Atomic Bomb. Possible missions could be the many failed assassination attempts on Adolf Hitler or fighting for Pieces of Eden with the Nazi Occult.
The New World
In the Vault, Minerva mentioned Temples that held great significance. These Temples could very well be the Aztec, Inca, or Mayan pyramids that are all across Mexico and Peru. Fransisco Pizarro was also confirmed by Subject 16 to be a Templar, so the idea of Conquistadors as more than just treasure hunters is not too far off for the Assassin's Creed universe. Crystal Skulls were also mentioned by Abstergo in the e-mails so a New World setting would most likely be the Templars and Assassins hunting down the Crystal Skulls.
Japan
Japan is also a possible setting for the third Assassin's Creed. The messages left by Subject 16 show Asian architecture and even one says "YONAGUNI". Yonaguni is the westernmost of the Japanese islands and is home to the Yonaguni Monument, a large underwater rock formation that has been said to be man-made. This could be a building of some sort left by Those Who Came Before. Adding to the probability of a Japanese setting is in the short video The Truth. In the background, the mountain looks remarkably similar to Mt. Fuji. This could be coincidence, especially since it does have notable differences than the actual Mt. Fuji, (Mt. Fuji has a larger base and a sharper peak) or it could prove that Japan plays a major role in the Assassin's Creed Universe.
i cant wait for it.. to finish the story