Xiaomi has previewed the MIX Fold 2, its next-generation foldable smartphone that will arrive a day after the launch of the Galaxy Z Fold4. Sporting a similar design, the MIX Fold 2 will be noticeably thinner than the Galaxy Z Fold4, even more so than the Surface Duo 2. Better still, the MIX Fold 2 will launch with Leica-tuned cameras too, the fourth smartphone to do so since Xiaomi and Leica announced their collaboration.