I think alot depends on how 'WWI' per se is modelled. Will it be an 'event'.. I doubt it. Don't forget that nobody expected the Great War to start, it evolved, and was firmly rooted in tensions that had been building in Europe throughout the 19th century. I would be suprised and disappointed if, sometime in 1914, an event pops up saying "OK, the Great War has started. You are now at war with X, Y and Z countries". Talk about derailing a game. WWI should be a danger to occuer at ANY time during this game. If you, as a major Euopean power, declare war on another in 1884, who happens to be allied with two others, and they in turn declare war on you... voila! WWI in 1884. This would be ideal. With this the case, you will spend the entire game trying to judge if it is 'safe' to go to war or not, just like they did historically. Pick your fights carefully. Naturally, after a full game of Victoria, seeing WWI develop along historic lines will be unlikely, but it will probably happen.