Here what you'll find in the box:
= Fishermen of Catan
2 fishing zones (numbers 5 and 9)
1 lake tile (numbers 4 and 10)
14 fish tiles (4x 1 fish, 5x 2 fish, 5x 3 fish)
2 reference cards
= The Rivers of Catan
1 new river tile (pasture, pasture, mountain)
3 plastic brown bridges
3 plastic green bridges
2 cards "Poorest Settler"
10 plastic gold coins (5x value 1, 5x value 5)
= The Caravan
1 extra oasis tile (back of lake tile)
11 extra plastic camels
= The Barbarian Invasion
1 extra fortress tile
12 extra plastic barbarians
6 plastic brown knights (horses)
6 plastic green knights (horses)
= Traders and Barbarians
2 extra border pieces (size "1")
1 extra castle tile (back of fortress tile)
2 extra quarry tiles
2 extra glass hut tiles
1 plastic brown tross wagon
1 plastic green tross wagon
18 trade good counters (6 for each destination tile)
5 brown tross cards
5 green tross cards
12 extra development cards
= Other
1 rulebook (6 pages of box size explaining all additional rules)
PS: For wood puritists: Wooden figures can be bought at CatanShop