The new jungle biome is similar to the vanilla biome and you'll find:

• Vanilla jungle trees such as big jungle trees, small jungle trees, cocoa trees and bushes
• A lot of vines

Its climate is hot so, it will be generated next to desert, savanna and forest biomes. Available from all supported Minecraft versions.
The new savanna biome is similar to the vanilla biome and you'll find:

• Vanilla savanna trees such as acacia and forest tree

Its climate is hot so, it will be generated next to desert, jungle and forest biomes. Available from all supported Minecraft versions.

• Added taiga vanilla trees such as redwood, tall redwood and mega redwood

Improvements and bugfix

• Replaced the bukkit vanilla-trees generation with my own implementation because it causes server lag and issues. With the newest implementation, not all the TreeTypes are available to generate, yet.
  Supported TreeTypes at this time:
  • TREE
  • BIG_TREE
  • BIRCH
  • TALL_BIRCH
  • REDWOOD
  • TALL_REDWOOD
  • MEGA_REDWOOD
  • ACACIA
  • JUNGLE
  • SMALL_JUNGLE
  • JUNGLE_BUSH
  • COCOA_TREE
  Other TreeTypes won't be generated.
• Fixed a lot of cut things
• Improved the async chunk generation
• Speed up the chunk generation
• Speed up the database writing so, improved world unloading and saving time
• FIXED 1.13 support due to a missing Material class method error.

Remember that this is not the final version and it may be subject to changes.
More screenshots at: https://imgur.com/a/iXTiACn