The development vehicle, still wearing camouflage, is currently being tested across the Rocky Mountains ahead of a confirmed world premiere in October 2026. Image: BMW GroupWhy the Rocky Mountains? October 2026 PremiereThe world premiere is set for October 2026, which gives MINI several months to complete development and build anticipation. Rocky Mountains testing appears to represent the final stage before the reveal. October 2026 will tell us whether the Rocky Mountains testing was worth the journey.