DynaMaya is an implementation of Dynamo with Maya. This is in beta and should be considered experimental. DynaMaya uses your base dynamo instillation so it will always follow the latest Dynamo development. In fact if you have Dynamo installed for Revit then you already have it installed for Maya! When you open Dynamo inside Maya it will see any additional packages you have already installed as long as they are not Revit specific.
The goal of the plugin is to create a fully unified workflow and overcome some the issues associate with interoperability between programs. By using Dynamo as a common platform you can access the full power of Maya with all of its advanced geometry creation including nCloth, blend shape, animation, joints and IK . While in Maya you can access the parametric powers of Dynamo by building on the Maya geometry with a familiar parametric node based system as well as access the numerous design and analysis tools such as solar analysis , and surface rationalization. The structure of the plugin is designed in such a way that the Maya geometry can be embedded into the Dynamo dyn file and directly opened in Revit or any other software that Dynamo is embedded into. This is meant to eliminate the need to export files or other methods needed to transfer from one software to another.
If you need to find out more about Dynamo please visit http://dynamobim.org. there is a wealth of information as well as access to the latest versions and downloads.