Passed it without any further preparation after cleared the ICE on 6/4 with a score of 73% without any previous encounters of ICE 483 or 484 and without any references during the ICE test. Thanks IBM for the free voucher. BTW, the passing mark is 63%.
Keep a watch on http://www-1.ibm.com/certify/news/index.shtml. IBM keeps distributing free vouchers for newly introduced exams and also occasionally for a number of exams. Ranchers are very alert folks and usually post in the forums moments after they appear there. Good Luck and best wishes.