Does Genesis 3 tell of a theophany? Genesis 3:8-9    (NLT)
  
  &nbsp;8 When the cool evening breezes were blowing, the man and his wife heard the Lord God walking about in the garden. So they hid from the Lord God among the trees. 9 Then the Lord God called to the man, “Where are you?”   


[Emphasis mine.]

Is this generally understood to be a theophany? The Wikipedia article mentions that Catholics believe that this is a theophany, but doesn't say anything about Protestant denominations.

Also, a very related question (that doesn't deserve its own question) is: does this mean that Jesus had a human body before He was born?
This is an example of a theophany. People often make the mistake of equating the descriptions of God with human form. Just because God is said to have a face, shoulders, a right hand etc. does not make him human. The same could be said of a koala bear [or enter arbitrary animal here!]. 

There are many, many references throughout the bible to God's "body", however it is unwise to assume we know what God looks like. We shall, ultimately, see His face and know Him fully as He is.

The incarnation is different. That is the phenomenal notion of God becoming a human being, fixed in time and space.

Hope that helps.