He never said she was going to be training to be a jedi. All that was said was that "In time you will learn to use the force as I have." That doesn't mean she is going to be a jedi, its largely an open ended conversation. Not to mention, that the context of that conversation was if Luke didn't return. Luke's comment was a response to Leia's hesitation caused by the possibility Luke not returning. I agree, though, its largely pointless to spin our wheels. We will see what happens when the movie comes out.