No fusions are really guaranteed, so even pre-changes, all you can confirm is the possibility.
However, some combinations had too few possible outcomes and were leading to a lot of epics going out. Gree seems to have taken ALL the epic armors off the fusion tables at the moment.
Yeah I noticed that. Just checked Blazeborne on the wiki and not only did the armor fusion change that supposibly worked in the beginning but they also mentioned that it had stopped all epics from being fused on 9/13. Not sure if it's confirmed though.