Oracle is working toward having the first certification exam for Oracle APEX. This “Oracle Application Express Developer Certified Expert” pilot program is intended for intermediate and advanced APEX developers. You will have to indicate the relevant APEX trainings you’ve completed, years of APEX experiences and, of course, the agreement to provide feedback in order to participate. You can see details about this from Joel Kallman’s blog.
I think this is a good thing for APEX community because it shows Oracle’s commitment to this tool.
BTW, I’m very curious about how the tests will be conducted. Personally I think there should be more of actual development hands-on works rather than doing multiple choices.