Building the test mule to look exactly like a CT 200h was a smart move by Lexus engineers, as it certainly discourages much analysis into their plans for the compact crossover.
That said, the measurements of the CT 200h are well-known — with a 102.4 in/2,600mm wheelbase, the CT is near identical in size to the Audi Q3 (102.4 in/2,601mm), but much smaller than the BMW X1 (108.7 in/2,760mm). In fact, the BMW X1 has a longer wheelbase than the Lexus RX, which measures at 107.9 in/2,740mm. For comparison, the new Toyota RAV 4 has a wheelbase of 104.7 in/2,659mm.
(Should point out that some enthusiasts believe this vehicle isn’t a Lexus at all, but a Toyota crossover coupe prototype. After seeing the next-generation Prius test mule driving around with a CT 200h interior, I suppose anything’s possible.)