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For Web and JPA refactorings there is no diff view for the elements to be changed in the refactoring preview window.
Will implement for 6.0 if there is enough time.
Dongmei, can you please update the bug on JPA. When you are done reassign it to web.
True that the preview diff is missing for refactoring (of entity classes) persistence.xml. The Web refactoring is logged in issue 153485. This bug is only for JPA refactoring issue now. Changed the Summary accordingly.
NetBeans.org Migration: changing resolution from LATER to WONTFIX