Hi all i just checked one site for the talents and i saw that with the new level cap at the update that is coming ( lvl 85 ) we can get both moonkin and tree of life and even 2 of the moonkin better form and 2 of the tree of life So just for people that ask this question ( can i get both of them ) yes you can when the new level cal comes out.
Site to see how to make it when it comes out :
http://www.wowhead.com/talent#zGRdkrusrkbZZRdGucuxddi0R