When I went there a couple of weeks ago, they didn't have a gluten free menu at all. I asked the English speaking Sushi chef, if they had gluten free soy sauce and they didn't.
Really good sushi. Has a pretty large GF menu and is pretty knowledgable about contamination. They have tamari sauce as substitute for soy sauce. Jun's is my favorite sushi place in town... Gluten free or not.