Shapes import into Terrain Builder will be pretty important for community projects. Real world maps will need it to import road and area data from sources like Open Street Map, and Arma 2 up-conversion projects will need it for automatic conversion of Arma 2 roads to the new road technology.
Terrain Builder at the moment can not import even simple shapefiles into a project, and also fails to re-import shapefiles that were exported (moments earlier) from the same Terrain Builder project.
The error given is:
"load vector data into project - Cannot transform from file spatial into V4 project spatial. Import Failed!"