The critical statement in this article is in the sub-headline. ". . . express concern over timetable for discussions of core issues." Translated in to reality that means 'Israel has no intention "to present proposals on borders and security within three months, and to reach a final agreement by the end of 2012." The 'acceptance of the Quartet 'plan' is conditional upon the negotiations never proceeding beyond talk and build.
Three Turkish soldiers killed, 14 wounded in PKK attack in southeast, army says (Reuters)
from the article: Israel accepts Quartet peace plan, urges Palestinians to follow suit