Broken: 2.77 7dc328e
Short description of error
1.Alembic import not correct imports keyframes of animation of camera focal length
2.Imported animated alembic mesh not render motion blur with Cycles, even with correct "motion blur / Deformation flag" on and steps set to 12 (for example)
Exact steps for others to reproduce the error
Just Import alembic mesh to see not working motion blur with animated mesh
For the camera focal length error, just import an alembic file with animated camera focal length to see is not keyframed/animated at all.