Easy Way to get DDL in Data Dictionary?

My company is going through a transition from one environment to another where they will not be able to communicate with each other.  At some point I will need to update our new environment with the updates to existing objects in the old environment, as well as all new objects created in the old environment, since the initial full database export.  That will be approximately 7 months between initial export to going live in the new environment.

My question is this, is there an easy way to retrieve the DDL code for an object from the data dictionary in the old environment to make it easy to create at least the new objects in the new environment?  I know the updates will be harder, but if I could find an easy way to get the DDL for the new objects I would have less work to do.