You couldn't create great looking, huge terrains. Until now. This hot feature allows you to use 2 different bitmaps: the regular old one (when the distance between the player and the terrain is big) and a smaller one that adds details to the terrain when the player is close.
 

Local variables

These variables exist only inside the function that defines them. If several copies of  the same function are running each copy uses its own independent set of local variables.
 

Terragen support, static terrain shadows

Med can import Terragen raw files for terrain. The good news is that Terragen can create skins that simulate shadows so your terrains will have shadows from now on.