Because Israel has no intention of agreeing borders, because that would bring the lucrative settlement enterprise to an abrupt end. Hence no map and no proposals. Instead, they come along with their 21 points, covering all the things they want the final agreement to contain - but that is not the purpose of the talks, which is to concentrate on TWO ISSUES ONLY, borders and security. It is not hard to see why, Israel is trying VERY hard NOT to talk borders, because it is not prepared to surrender Area C territory and its settler base. They must be trying even the Americans' patience more than somewhat already, let alone the rest of the Quartet.
UN: Gaza could be 'uninhabitable' by 2020 if trends continue (AP)
from the article: Palestinians: It's up to Israel to get peace talks going