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Mercedes-Benz had planned to unveil the 2010 model year S63 and S65 AMG before April's end at the Shanghai Motor Show, but the high-performance S-class models have unwittingly been given an early internet unveiling by the company's own German market online configuration utility.

The refreshed limos will continue to get their weapons-grade thrust through big engines (the S63 has a 6.2-liter V8 giving 518 horsepower and 465 pound-feet of torque, while the bonkers S65 gets the twin-turbo 6.0-liter V12 engine good for 604 hp and an absurd 738 pound-feet of torque), but the AMG models will finally get more visually distinct, thanks to new LED light strips, a more aggressive front fascia with an enlarged air gulper, bespoke grilles (the S63's fixture has five horizontal bars, and the S65, shown above, wears three double-bars). The S63 and its pricier S65 brother will be further differentiated by unique wheels, badging, and bespoke exhaust treatments.

The blokes at Car and Driver (who spotted the MB consumer website gaffe) say that America will probably continue to only get long-wheelbase models of these two, and prices are expected to be similar to that of the 2009 models, which retail for $131,350 and $198,950, respectively.

[Source: Car and Driver via WorldCarFans]