Although schools generally prefer to gather performance data on a new test or test section before fully incorporating it into their evaluation process,GMAT test takers should not take GMAT Integrated Reasoning any less seriously than the Quantitative or Verbal sections
http://www.usnewsuniversitydirectory.com/articles/business-schools-reluctant-to-embrace-new-gmat-sec_12735.aspx#.UI6hxWfkbTo