Welcome! There's some initial feedback from
Immortius on GitHub on the
flora bit if you would like to play with that to begin with
Marcin Sciesinski is working on some multi-block stuff based on the multiplayer branch, which is further along with the entity system than our current develop branch.
Skaldarnar is into procedurally generating structures, which of course also tends to get close to the multi-block topic.
Take a look at the
Dev Setup page to get started forking and tinkering with Terasology and just pop up on IRC whenever you have questions
