Spy photos show soft-top roof of SLS AMG Roadster. The model will be making its debut later this year.

These are the latest spy shots of the upcoming 2012 Mercedes-Benz SLS AMG Roadster caught while on a winter test run in Lapland.

The model is now in its final stages of development as its debut nears and the cold-weather testing likely involves taking measure of that soft-top roof.

The SLS AMG Roadster prototype is still wearing some body camo in these pics but you can easily make out the look of that retractable canvass very clearly, which is going to be its most distinguishing feature vis-a-vis the SLS AMG coupe. That and, of course, its non-gullwing doors.

The SLS Roadster will be powered by AMG's 6.3 liter (6,208cc) V8 with an output of 420 kW (571 PS / 563 hp) and 650 Nm (479 lb-ft) of torque. The 0-100 km/h sprint will clock in at 4.0 seconds and top speed will be 309 km/h (192 mph).

The Mercedes-Benz SLS AMG Roadster will make its debut at the Frankfurt motor show in September.

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