You should check with Oracle sales rep who can get you in contact with the licensing folks to get a definite answer. But, I would imagine, you would need an updated license, otherwise when you log a SR, they might tell you that you do not have support for weblogic only ias. Furthermore, you might need to pay for a transitional license during your upgrade in case it is a phased approach and you need to have both version running side by side for a period of time. Bottom line, check with an official Oracle rep.
same license cost will be carry forward as it is EBS