The actual, actual retail chips seem to be clocking better so far. 4.8 on a Hyper 212 is is Sb territory. I'm trying to find a reason not to get Ib now instead of not to get SB like over the past week.
http://www.overclock.net/t/1249693/my-ivy-bridge-3770k-oc-results
http://www.overclock.net/t/1249693/my-ivy-bridge-3770k-oc-results
and to be honest 4.8ghz is not guaranteed on a SB - so the Ivys aren't all bad 
