Based on this latest set of spy shots, it appears as if Porsche may also be working on a new range-topping model to sit above the Turbo S. If you look closely at this test mule, you can see it's wearing a set of center lock wheels. That's a feature you typically only find on track-bred models like the 911 GT3 RS.

Porsche has never offered center lock wheels on a Panamera before, which leads us to believe this could be a new specialty model. It could adopt the same Turbo GT nomenclature used by the Cayenne, an SUV that claimed a Nurburgring record earlier this year.

We've known for a while that Porsche is cooking up a facelift for its Panamera sedan, which will likely debut next year as a 2024 model. It would also be the perfect time to introduce an all-new halo model.

The most potent gas-only 2023 Porsche Panamera Turbo S currently produces 620 horsepower from its 4.0-liter twin-turbocharged V8, meaning there is still some room left to reach the Cayenne Turbo GT's 631-hp output. Lamborghini has also proved that it's possible to get as much as 657 hp from this particular engine. It's worth noting that Porsche also builds the 690-hp Panamera Turbo S E-Hybrid, but that model is significantly heavier and less track-focused than a hypothetical Turbo GT would be.

A Panamera with center lock wheels would likely focus more on weight reduction and maximum performance rather than efficiency. Even if this is not an all-new Panamera variant, the GTS could get center-locking wheels as an option for the first time.

Porsche definitely has something up its sleeve because our spy photographers say this is one of the loudest Panamera test mules they've heard.

We know the facelifted Panamera will get a revised interior similar to the Taycan. On the exterior, expect to see new headlights, taillights, and bumpers.

With the Taycan easily overtaking it in sales, it's nice to see that Porsche is still putting some effort into the Panamera for this facelift, as it will likely be the company's final gas-powered sedan.