RHINO 5SR12 - u knows what changed vs Rhino 5SR11

Hello there.

Does any one know what are the major changes and bug fixes in the last release of Rhino 5 SR 12??

i need to compare Rhino 5 SR11 with Rhino 5 SR12
Does this new release have improve shadows quality?
Does it fixed the TESTZBIASFACTOR bad edges?