The dispute between Arduino SA, and Arduino SRL formerly Smart Projects SRL has gone to court. http://dockets.justia.com/docket/massachusetts/madce/1:2015cv10181/167131
Nature of Suit: Trademark Cause of Action: 15:1121 Trademark Infringement
Smart Projects are official manufacturers of Arduino boards, and it seems they believe they have a claim to the Arduino name and trademarks.
This is bound to distract both companies from supporting and innovating Arduino products, but hopefully will be resolved before too much money is wasted on lawyers.