I have exactly the same question... so I will answer with what I think about it.
Since JPA is from Sun/Oracle I doubt there will ever be an EJB-less, JPA-only certification. If there was a Hibernate certification, I bet you'd get many proprietary topics in there that would outweigh the EJB stuff. So, it's probably acceptable to have the EJB stuff in there, even if you use another framework to do the business logic. I'm using Seam to get past the manual EJB stuff, but my guess is you can't avoid it for the certification.
OCJP JavaSE 6 (86%)
Joined: Nov 20, 2010
Probably other than SUN/Oracle some other clients would be giving Hibernate Cert which we are not aware of?
From Hibernate/JBoss itself?
Of course Hibernate certifications would come from JBoss only, but I haven't heard of anything like this. However Hibernate itself has so many wrinkles and JPA things that aren't working, so I believe such a certification would be very risky to offer.
In any case I'd go for the JPA and EJB exam. It's the best compromise IMO.
I rather wonder how to prepare for this exam because it's so new...