Snapped undergoing cold weather testing, the heavily camouflaged prototype has a sloping roofline, a power-developable rear spoiler and a two-tier hatchback.

Our spies have already caught the 2013 BMW 3-Series Gran Turismo on numerous occasions, but here are the latest photos of the upcoming model.

Snapped cold weather testing, the heavily camouflaged prototype has a sloping roofline, a power-deployable rear spoiler and a two-tier hatchback.

Engine options will likely carryover from the sedan, so expect petrol choices to include a 2.0-liter four-cylinder with 245 PS (180 kW / 241 hp) and a twin-turbo 3.0-liter inline-six with 306 PS (225 kW / 302 hp). On the diesel side, there should be a 2.0-liter four-cylinder engine with outputs of 163 PS (120 kW / 161 hp) and 184 PS (135 kW / 181 hp).

The 3-Series GT could be unveiled at the Paris Motor Show, before being launched in March 2013.

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