The Unity3dbuilder node does not properly link to the new Unity 4.0 version.
When trying to select the unity installation, none show up.

STR:
Install the Unity3DBuilder add-on
Create a freestyle build configuration.
Under Build, Add build step "Invoke Unity3d Editor"
Select Unity 4.0 from the Unity3d installation name dropdown

Expected: Unity 4.0 should show up (like Unity 3.5 did before)
Actual: Nothing is in the drop-down menu