One does not exists for vSphere 5 ... yet.
lamw,
Do you have any contacts within VMware that could give an estimated availability date of the 5.0 guide, or even a draft? It is going to cause problems for my organizations' 5.0 migration, so it would be great to have.
Thanks!
Drew
Use the VMware vSphere™ 4.1Security Hardening Guide , it is still very relevant.
I can't give you a date that it will be available, but I can say it is being worked on and should be available soon. There is a small discussion on one of the internal mailing lists about this.
If I was you I would follow Troy's advice. Design based on the 4.1 guide and make any small changes when the 5.0 guide is released.