Per Today's press release:

The world's first Sports Activity Coupe, combining the sporting elegance of a large BMW Coupe with the powerful presence of a BMW X model. With two variants, both with Twin Turbo and direct injection, the X6 xDrive35i (3.0 inline six-cylinder engine, 300 hp, 300 lb.-ft torque) will be available in May and the X6 xDrive50i (4.4 V8 engine, 400 hp, 450lb.-ft torque) this summer.