Bit the bullet and did the update so we could put our control panel token bug issue behind us, noticed that there were 2 API changes...
Previously, the GetAutoResponderSettings call was simply settings/auto-responder, however, they added a URL parameter to return HTML or not, so settings/auto-responder/(true|false)
The "mailStoreVersion" parameter returned from the settings/sysadmin/domain-settings is now simply just a string of the version, previously it was a json object that had major, minor, build, revision, majorRevision and minorRevision properties. It is now just a string of the value, "7.0".
Those are the changes we've found thus far that required altering.