Bungie has filed several trademarks that may be related to Destiny according to a new report at Gamespot: "One is for "Eververse"; another covers "Eververse Trading Co."; and a third pertains to the "Eververse" logo" below.
Whether Eververse is related to an expansion or not remains to be seen and Bungie seems to be holding its cards close to the chest and is also cagey about another recent trademark for "The Taken King".
Read more at the link above.