Here I am, back as CC4 beta tester...
Problem: I'm trying to add morphs to my characters, but CC4 can't output consistent models. For example, after the base model, you export another version, with pregnant belly, and import both into Blender. You can zoom in and see in Xray mode that the top of head and arms don't match. I tried with both official and custom sliders, same thing happens.
There is a compounding factor that I couldn't understand too, since the effect is much worse on my character that I imported from CC3. Since it moves the body away from the eyes and mouth, it makes shapekey-making essentially impossible. This problem didn't happen in CC3.
76% of original size (was 660x19) - Click to enlarge

Steps to reproduce problem:
1. Export base model.
2. Apply Pregnant slider to max and export.
2. Import both versions into Blender and compare.