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I think the prime benefit is that the game'll have greater access to more memory in your system (32-bit's limited to 4GB), which should address some of the crashing that occurs, especially during world bosses.
Not yet, but if preorders are live can't be too far off. My speculation is about 10 weeks - 5 specializations, 2 Revenant lines, Challenging group content and 2 weeks breathing room. Oh that coincedes with PAX day 1 and the GW2 launch date? How odd..