The General Assembly can't even give them a virtual state if they are not defining what the borders of this state they want are and until its negotiated they can't seek UN membership. All they are going to get is a General Assembly resolution endorsing talks ( which for 3 years Abbas has refused to take part in ). If thats the case they won't even need to worry about how the US feels because its basically only calling for negotiation so there is no need to go to the Security Council where the US has a veto. At the General Assembly they could demand Israe will forcibly be turned into a binational state through UN military action if needed and they would get overwhelming support because the General Assembly loves the arabs and hates Israel. As for the idea of any resolution that even mentions the idea of a fair arrangement for right of return and compensation for refugees, stick that in their and the US will vote against it. Right of return is nothing but a fantasy based on a UN General Assembly resolution. if they deicide to demand a state within pre determined borders and UN membership it will go to the Security Council and the US will veto it which will hammer the final nail in the peace process coffin and lead to an intafada and Cast Lead 2.
Russia vetoes UN resolution on MH17 special tribunal (Reuters)