COPE has now been successfully transferred to Eclipse EMF Edapt. Edapt no longer requires Groovy, but specifies migrations directly in Java. Try out Edapt by using the update site or inspecting the source code.
Here is the original proposal.
2011/08/16 - A tutorial that gives an overview of Edapt can be found here.
Thanks to MARINTEK for supporting the transition of COPE to Edapt.