Arby's has unveiled four new sandwiches, each including a mozzarella-topped bun. The chain has also hired Jenna Bromberg, former CMO of Papa John's, as its new chief marketing officer. These changes are part of Arby's recent efforts to renew its menu and marketing strategy. The new sandwiches are currently being tested by the company. Bromberg's appointment comes as Inspire Brands, the parent company of Arby's, prepares for its IPO.