Content issues in Mecanim FAQ

Unity 5.0.0b21/Editor/Data/Documentation/en/Manual/MecanimFAQ.html

"We are using the legacy animation system for character animations. Should we be using Mecanim instead?
Mecanim is the main animation technology that will be used and developed by Unity from now on. The legacy system will not be updated significantly."

The question is not really answered. Give a decisive answer such as the answer given in section on Legacy animation system:
“Prior to the introduction of Mecanim, Unity used its own animation system and for backward compatiblity, this system is still available. The main reason for using legacy animation is to continue working with an old project without the work of updating it for Mecanim. However, it is not recommended that you use the legacy system for new projects.”

"Is there a way to create AvatarIKGoals other than LeftFoot, RightFoot, LeftHand, RightHand?
This feature is planned for a future release."

We now have also the knee and elbow IK in 5.0