As you can see from the screenshot, there has been some improvements to the swampy biomes. The water colour changes and so does some of the terrain, there are also lilly pads in the water.
Item list names in hotbar are as follows
SLOT 2 blaze rod SLOT 3 Ghast tear SLOT 4 Unnamed SLOT 8 AND 9 Nether Brick Fence and Nether Brick