For over 2 years now Abbas has been flatly refusing to even talk without a whole range of pre conditions ( which he knows full well Bibi can't deliver because of his coalition ). Even when Bibi gave him a 10 month building freeze to entice Abbas into talks instead of saying you made an effort so will I he dreamed up new preconditions to avoid talking. This is also not the first time he has said I prefer talks to the UN and then he changes his mind and says he is not interested in talks he wants the UN. After Obama made his speech calling for talks on the day of the speech Abbas was saying of course I prefer talks. A couple of days later he was saying he intends to go to the UN. The Arab League has given the green light to going to the UN along with 99% of the palestinian political top brass and Hamas have made their intentions clear that that the only option they will accept is the UN. This is more Abbas talk and in a few days he will be going on about the UN again. If Abbas does go to the UN he won't solve the problem, all it will do is make negotiations in future near impossible because any palestinian leader who wants to negotiate will be seen as a traitor. Going the UN route is also not about peacemaking.
Palestinian teen arrested for allegedly rioting in East Jerusalem (Haaretz)
from the article: Abbas says prefers talks with Israel over UN vote on Palestinian state