So the real required pre-condition is that Settlement building does not go ahead. Part of resolution 377 says that with a vote of 7 members of the Security Council or a majority of the General Assembly an emergency session of the General Assembly can be called (ie much sooner that September). The Resolution can be put and sanctions can be placed on Israel for not stopping settlement building as required by law. Come on Abbas, take it to the General Assembly or get 7 members of the Security Council to back you.
Wreckage found on Reunion island triggers speculation over missing MH370 (DPA)
from the article: The UN is ripe for advancing the Palestinian agenda