Traditionally, seeing a tree with new green leaves can be interpreted as an omen of abundance which could mean that there will be economic and sentimental abundance. As well as it could mean that there could be ideas, that will be followed through. But on the other hand, seeing leaves fall from the tree means that you can lose something very important, but only for short period of time. It will come back again in your life.
Read more about dreaming of Leaves in other dream meanings interpretations.