Hi Julio,
Thanks for posting in the vSphere Replication community.
A public API for vSphere Replication has been on the road map for a while. The feature request is now in the execution stage.
I cannot say in which product version the public API will ship or when it will become generally available. I can say it is unlikely that the feature will be mature enough to ship in 2015.
If you are interested in early access, please watch out for this feature on the what's new list at the next vSphere Replication beta program.
Best,
Hristo