We currently just show "Template parameters changed". The complication here is that a transclusion can be made up of multiple templates (e.g. a multi-template-generated table), but as a first step we could at least just handle the single template case.
ve.dm.MWTransclusionNode.static.describeChanges = function () { // TODO: Provide a more detailed description of template changes return [ ve.msg( 'visualeditor-changedesc-mwtransclusion' ) ]; };