The Quartet deetermined that the talks will last until January 26th, by which time Israel and the PA will present their view on the final borders. The PA did so, while Israel is trying to delay by presenting "principles" without details instead. According to Israel, the intended Quartet deadline is really early March. Let us say this is so (against common sense). But why wait? Will Netanyahu know more in 6 weeks than now? My theory is that after early March there will be another delay (excuse yet to be determined) until the end of March, when Netanyahu expects his coalition to collapse due to the Migron evacuation, and elections to be called. During the campaign, it will not be possible to negotiate, of course. Once he is passed the election, Netanyahu could afford to be braver. Before the elections, he cannot admit to giving back any piece of Greater Israel, which is against Likud's ideology and constitution.
Israeli PM to Palestinian President Abbas: We must fight terror together (Haaretz)
from the article: Israel presents the Palestinians with its stance on borders