lurker's comment: Actually, the MDI appears in PTW, but that's pretty
Also, the Dutch's Seafaring trait is a lot less useful on large continent maps. Seafaring does best on Archipelagos, and smaller maps. It's still useful on continent maps, but it's harder to suicide curraghs/galleys the bigger the map is, which is what human players often use seafaring's extra movement point for.
The Agricultural Trait, on the other hand, helps you no matter what (especially if you get one of those desert starts- it will make those deserts productive), which is why agricultural is considered the best trait by many.
BTW, darski, just to tell you, there are trait changes to some of the civs in C3C. The Iros are Agricultural/Commercial, The Aztecs are Agricultural/Militaristic, and England is Commerical/Seafaring. There are also trait changes to the PTW civs, but you probably don't care much- you can find out what those changes are easily when yiou get your disk.
I would suggest you read some parts of the civilopedia well- there are many more changes to Vanilla/PTW things than these (For example, Ironclads are now 5/6/3 rather than 4/4/4), and plenty of new stuff.