Olixar Cases Leak Sony Xperia Z4 Design Ahead Of MWC 2019 Reveal Leaked images of Sony Xperia XZ4 Olixar cases confirmed earlier reports of a tall screen with a 21:9 ratio. Sony has scheduled to reveal the upcoming device at MWC 2019 on Feb. 25 to 28 in Barcelona, Spain. by Jester Valdez