There are some youtube videos which have all, and I do mean ALL of the main scenario cutscenes, its 1-2 hours long.
As far as the world changing from 1.0 to 2.0, part of it was a, uh, excuse... lets say, to really rebuild the game.
In 1.0, there were a LOT of reused textures and regions. The 4 main maps (Shroud, Thanalan, La Noscea, Coerthas) looked different, but inside of the maps it was the same textures and rock formations again and again.
At the end of 1.0, Bahamut breaks free and quite literally levels EVERYTHING. It takes what, 5 years? for the land to start recovering.

...Yeah, what Felis said...