I haven't seen official objectives for the RHEL7 RHCE/RHCSA exams, yet. CertDepot has the RHCSA and RHCE objectives for EL7 posted.
My RHCE (EL5 based) expires any day now, and so I probably should start working on updating my brain for the new bits in EL7. Big things are going to be swapping System V init with systemd, and the old standard of iptables with Firewalld.
Sadly after RHEL6 went GA, the Red Hat policies changed from certs expiring after 2 major releases to them expiring after 3 years. I also believe that you now need both EX200 and EX300 for the cert, not just one monolithic exam.
I may have to look into taking other exams, rather than keep retaking the CE exams to keep my cert live.