Really there is not much new stuff. Stuttering research is always following psychology. Stuttering treatment, on the other hand, just changes the name and sell to a new generation. Think about mindfulness for stuttering treatment. Quite trending now? But Yoga and meditation was popular in Germany around 100 years ago. Basically many people tried many different things in the past. Anything behavioral in nature probably has been tried before. Only thing new is probably the medication. But so far no good data.