Obama stated explicitly that negotiations between Israel and Palestine should start from the 1967 borders. Now there is a lively discussion in the Jewish American community about it.
Obama speaks at AIPAC
I think this is a positive development. Even though he has not said anything drastically different from what has been implied by many administrations, making this explicit has actually added information. Before, each side believed what they wanted to hear so that they could pretend that they agreed.