There are hero balance changes, but typically when there is some level of rework for that balance change. For example the recent balance change for Tracer could not be duplicated on the Experimental Card in the old patch.
However to get on your speculation, I know there are still some minor “quality of life” updates for the Career Profile still promised to us such as the ability to sort player icons. This next patch will very likely be the major patch for the Anniversary event, which we almost always get a new “toy” to play with to some extent (though sadly last year, we didn’t get anything too new).