In the US, the RX350's 3.5-litre direct injection V6 is expected to deliver around 224kW of power, an improvement of 20kW over the current SUV. Power will be channeled to the ground via an eight-speed automatic instead of the presently used six-speed auto.
For the hybrid RX450h, a 3.5-litre Atkinson-cycle V6 will be teamed with a set of electric motors to deliver an estimated 224kW of power.
Lexus has yet to provide performance or fuel economy figures for either drivetrain, although we do know that both models will come with 18-inch wheels as standard and 20-inch rims as an optional extra.
Some US-bound models will be equipped with Michelin's EverGrip tyres, which features rain grooves that expand as the tyre ages and has emerging grooves that pop up as the tyre wears. An F-Sport package is optional on all-wheel drive models.
Measuring 4.89 metres long, 1895mm wide and 1.69m tall, the new RX is 120mm longer, 10mm wider and has a roof that's 35mm closer to the ground than the soon-to-be-superseded model.
At 2790mm long, the fourth-generation RX's wheelbase has grown 50mm from the car that's currently on sale.
Sitting astride the dashboard is a 12.3-inch high resolution screen, while in front of the driver is a colour head-up display. At the rear, the RX will be available with heated seats in the outboard positions, as well as dual 11.6-inch screens mounted on the front seat backs.
The RX is available for the first time with adaptive variable suspension. Other tech features include lane departure warning, automatic high beam, radar-guided cruise control, blind spot monitoring, rear cross traffic alert, automated emergency braking, and a surround view camera system
The new RX will enter production later this year at Toyota's factories in Japan and Canada. The RX will go on sale in Australia some time in 2016.