The company currently has not announced plans to localize Summon Night 6 for western territories, but the trademark could suggest it’s in the cards. But don’t get your hopes up too much. The subtitle for God Eater 2: Rage Burst was trademarked by Bandai Namco in January, but a localization is still unannounced.
Summon Night 6: Lost Borders is due out for PlayStation 4 and PS Vita in Japan in spring 2016. If you missed it, catch the teaser trailer here.
Update 10/08/15: The trademark was also filed in the U.S..