Mildly revised looks are likely to hide a comprehensive powertrain overhaul for Porsche's mid-size SUV.

Porsche has teased the facelifted 2019 Macan one more time, ahead of its full reveal in Shanghai, China tomorrow.

Spy photos have already given us a clear picture of the front end, but this new teaser reveals the tail-lights will get a linked signature in keeping with the Panamera and Cayenne. No surprises there, although Porsche did a good job of concealing it on its development mules.

Up front, there's a new bumper with higher-set air intakes and a smiley aesthetic more in keeping with its bigger Cayenne brother. We're expecting to see revised headlights, but Porsche has done a good job of hiding them away under camouflage.

Our sources have said the biggest changes to the Macan will come under the bonnet, with the death of the diesel option and upgraded petrol units offered in their place. The 2.9-litre twin-turbo V6 from the Panamera looks likely to feature in the facelifted Macan S and Turbo, albeit in two different states of tune.

The base model is expected to get around 225kW instead of the 185kW currently offered by its 2.0-litre four-cylinder engine. The rumour mill has also suggested a plug-in Macan e-Hybrid is on the cards.

We'll know more when the car is fully revealed in China overnight. Stay tuned for more!