Get your certification now. The release date of RHEL 7 will not affect it, at least per http://www.redhat.com/training/certi...ification.html
Your cert is good for 3 years from the last applicable exam you took. The way I read the link, if you pass the RHCSA on June 1, and the RHCE on July 1, your cert will be valid until July 1, 2016.
As I do not speak for or represent Red Hat, you should verify with them.
As I do not know what you mean by "do the needful," I am not sure that I have answered all of your questions.