There is an issue that Abu Mazen can not give up on, maybe some major settlements can remain in return for the right of return. Gilo, Ariel at least. As for East Jerusalem, well if the Israelis want peace with the Muslims that shouldn't even be an issue for the discussions with the Palestinians.
State comptroller to PM: Focus on answering Gaza war report rather than criticizing it (Haaretz)
from the article: Israel, PA agree to strive for deal by end of 2008