In general, I think there are two major change for the JIRA
1) Old 1.1 server adapter use EMF as a modeling tool to handle deployment plan, but in GEP 2.1 and 2.2, EMF has been replaced with JAXB. So the first change is to handle deployment plan with JAXB instead of EMF.
2) Deployment plan editor enhancement. Since GEP 2.1&2.2 has enhance the usability of deployment plan editor, 1.1 server adapter has to use the new editor for consistency.
But I have another concern about this JIRA. If it's implemented in GEP 2.2, the final release of GEP 2.2 contain four server adapters - 1.1, 2.0,2.1,2.2 . Seems it's a all-in-one release. But not all users need four server adapters, is it necessary to bundle four server adapters into one distribution?