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I've been looking at some video footage of this game and in theory it looks really really good.
This guy talking about how you fly through instances to make it look that your in one big world. sounded complicated but he didn't think it was much of problem. You could still fire at a player while you were crossing over instances.
It's shaping up to be a ground breaking space mmo imo.
I would go as far as to say i would definitely through a few quid upgrading my pc for this game when its released.