The image names in the EAP for OpenShift guides need to be updated to whatever image names are going to be used for the EAP Online 12 release.

https://access.qa.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform_online/12/html-single/red_hat_jboss_enterprise_application_platform_for_openshift/

https://access.qa.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform_online/12/html-single/red_hat_jboss_enterprise_application_platform_for_openshift_online/

I'm also not sure if the default middleware image streams will include these EAP online images, or whether they will need to be imported in manually from the Red hat Container Catalog like we have documented for the regular EAP images for OpenShift Online.