Well as Polemists pointed out, the victory conditions in Empire are going to be different this time around, as whether or not you "win" is determined by how much Prestige your nation has. Since prestige can be gained a number of ways (amount of money, number of battles won, level of technological advancement, etc.), it apparently will be possible to win the game without having to conquer half the map. So at this point, it's really hard to say whether ~200 turns will be sufficient or not.
Personally, I do feel like it won't be enough (and will likely play the first mod that gives us four turns per year), but I could very well be wrong.
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