With a body built entirely from carbon fiber -- from the monocoque to the body panels and trims bits -- the fixed-roof Centenario shaved about 121 pounds when compared with the Aventador. Expect similar weight savings from the Roadster.
You can also expect similar performance. Zero to 62 mph (100 kph) in just 2.8 seconds. We're not sure how the Roadster's top speed will differ from the coupe's, which is already nebulously defined as "somewhere above 218 mph."