It would be really nice that LDOMS would be considered as a HW partitioning technology.
At the moment I'm partitioning T3-2 to be used in Oracle RAC DB. I'm forced to create a single non-global zone inside each one of the guest domains because of this licensing issue. This just adds extra overhead, extra configurations (and maybe extra mistakes!).
...and a companion white paper will be published on OTN in the next couple days with some additional information. As with all pricing and licensing related issues, Oracle customers should work directly with their Oracle Sales manager for all final answers.