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These are some of the first spy shots of the next-generation Lexus GS testing in Germany somewhere close to the Nürburgring circuit.

The current generation of the GS is already five years old now and due for a generational change-over. These shots show the next GS still operating as a test mule(s), so the model may have a few more developmental steps to take.

But the Japanese premium brand continues to have grand ambitions for the GS range.

According to previous reports, Lexus is intent on building a GS-F variant to take on the performance sedan likes of the Mercedes-Benz E63 AMG and the BMW M5. But in order to do so, the model is going to need a power rating of around 550 hp.

Speculations suggest that level of power would come from the same 4.8 liter V10 as in the LFA supercar that produces 560 PS (412 kW) and 480 Nm (354 lb-ft) of torque.

The next-generation Lexus GS is due sometime next year as a 2012 model.

Gallery: First spy shots of next-generation Lexus GS

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