If the requirements are the same than in the first episode your rig may be ok, but it could be a good idea to upgrade your GPU, which seems a bit outdated, maybe for a GTX 260 or 275, just in case they raise the requisites.
Check out Game-Debate for the Assassins Creed 2 system specs. They also have a neat tool that allows you to check your system specs against those of the game.
i so far haven't seen a trusted site mentioning AC2 specs. All i see are pretty the same specs as AC1. From what i see of video's of it, it's going to require a much more power that AC1
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