I enjoy reading about new bikes, design, and this one now has my eye. Been thinking of getting a plated dirt bike and the radical design, light weight, and ground clearance of this BMW makes me drool.
Here's a nice review of this race class enduro.
The most interesting design feature is the countershaft serves as the swingarm pivot bolt hole, allowing the countershaft sprocket to rotate around the swingarm pivot point. This eliminates the need to adjust the chain to accommodate the wild variations in tension due to 12 inches of rear wheel travel. However, I also read this may make changing out front sprocket a chore.
Curious on your thoughts regarding the new G450X. Here's another review covering similar details.