Our spy photographers have caught a 2012 BMW 1-Series undergoing winter testing in Northern Europe.

While still heavily camouflaged, this particular prototype, which we've seen on several occassions (see related links below), only has one tailpipe despite having two exhaust pipe cut-outs in the bumper fascia.  Previously seen with two tailpipes indicating a turbocharged model, this prototype has a naturally-aspirated engine this time around. Regardless of its powerplant, the redesigned 1-Series will feature modern styling, LED taillights, and a bold twin kidney grille.

Under the hood, petrol engines will likely include a 105bhp (78kW) 1.3-liter, a Peugeot-sourced 1.6-liter turbo with at least 136bhp (100kW), and a 3.0-liter twin-turbo M1 with 350bhp (260kW) and 500Nm of torque. The latter engine will be paired to a double-clutch gearbox, which should allow the M1 to accelerate from 0-60mph in 4.7 seconds or less. On the diesel side, we can expect the 118i with 150bhp (112kW), the 120d with 184bhp (137kW), and the 123d with 211bhp (157kW). BMW's recent foray into the world of EfficientDynamics could also result in a "green" 1-Series with ultra-low emissions and stellar fuel-efficiency, not to mention the ActiveE version.

Recent spy photos have also shown BMW has been testing the 1-Series with a Kistler RoaDyn wheel force and torque sensor system (typically used for testing four-wheel drive and all-wheel drive vehicles). This could mean the 1-Series could be offered with xDrive, but we cannot confirm this as of yet.

Look for the redesigned 1-Series five-door to go on sale in mid-2011, with coupe and convertible models expected shortly thereafter.

Gallery: 2012 BMW 1 Series 5-Door Latest Winter Testing Spy Photos

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