Age of Conan - Interview @ Official Site

JeuxOnline's interview with the Age of Conan team has been reposted at the game's official forums.  Here's a snippet from the English translation.  German and the original French version are also available.

4. Will Age of Conan be optimized for 32 or 64 bits ? DDRI or DDR2 ?

We will have native 64 bits version of the game which should run faster than the 32 bit one. It is difficult to say exactly how much faster it will be right now as we are in a constant process of optimizing the game.
Regarding DDR memory it may show up that with DDR2 it will be faster. Again, as we are now in full optimization mode, we don’t want to give you the exact readings we currently have as these may change.
It will however, as it stands right now, be memory bound, and in this case DDR2 might help. (from Sergey, Game engine developer)