The official map to use with: Technological Advancements
The map is completely optional though, so you can play any seed you would like.
The map will be the official map for now to use so you can transfer player data if you would like between worlds to play with friends. Server use is allowed and just ensure you play it with the modpack or it will not work. Every biome is enabled with the Aether and Twilight Forest enabled. Have fun! The developer will continue to update his version to get an inside look on how everything works.
