Changes to VTK polydata between 4.10 and 4.11

I have noticed that VTK meshes imported in 4.10 and 4.11 differ in their spatial location. Rotation by 180 corrects for this. I presume this is down to a different interpretation of the VTK coordinate system. between the slicer versions. Does anyone know why these are different?

This is probably due to the change in 4.11 in the way coordinate system of model files are handled in 3D Slicer