Shown below is how to create the portals to the new dimensions, the Dreadlands and the Havenlands. You can click on the GIFs to navigate to their pages!
The Dreadlands portal is created with 4 corner nether wart blocks, 4 edge tinted glass, crying obsidian below the center, and lava in the center. Lit with blaze powder.
The Havenlands portal is created with 4 corner warped wart blocks, 4 gold blocks, crying obsidian below the center, and water in the center. Lit with blaze powder.