A facelifted version of the Bentley Continental GTC has been spotted in testing recently, and now the word on the 'net is that it will see a public debut at the Frankfurt Motor Show this September.

It's expected to pump 567 horsepower and 516 pound-feet of torque from a 6.0-liter W-12 engine, and be capable of running on straight gasoline or E85. The updates for the 2012 model year include a sharper, more heavily creased look, LED-accented headlights like those found on the Mulsanne, and a revised rear bumper cover.

An optional 4.0-liter V-8 may also be available throughout the Continental range, as it's expected to come around the same time as the new GTC.

A facelift is also in the works for the Continental GTC Speed, captured here by our spy photographers, and in addition to the updated bodywork, it is expected to get a bump in output beyond the current car's 600 horsepower and 553 pound-feet of torque. Expected performance figures put the car at about 4.4 seconds to 60 mph and a top speed closing in on 200 mph.

The GTC Speed could come alongside the standard GTC, or it might wait a few months until the early part of 2012. Whenever they come, we'll be on the scene to bring you the latest as it happens.

[Car and Driver]